Country or area · Western Africa · Africa · UN WPP 2024

Sierra Leone population

Sierra Leone population now

9,040,046

A projection read at this second, not a count: the UN's totals for 1 January 2026 and 2027, joined by a straight line. 95% range for 31 December 2026: 8.6–9.6 million.

Mid-2023, UN estimate: 8,460,512

Year: 2026; projection · medium
Population, mid-2026: 8.99675 million; 95% range, 31 Dec: 8.6–9.6 million
Median age: 20.9
Aged 65+: 3.3%

Move through time, 1950–2100

2023 | 2024 peak 2092

male female projection · one cell = 2,000 people

How to read this: one row for each age, newborns at the bottom; men on the left, women on the right.

Verified 2026-09-30 · 73 canaries

SLE · 1950–2100 · in brief

Sierra Leone in numbers

In mid-2023 there were 8,460,512 people in Sierra Leone: the 102nd-largest population of the 236 countries and areas the UN reports, and 0.10% of the world's people. That is 4.2 times its 1950 population of 2.0 million.

The UN's medium projection has it peaking in 2092 at 16.0 million, then falling to 15.9 million by 2100. The projection is uncertain: on 1 January 2100 the UN's 95% range runs from 7.5 million to 37.6 million.

The medium projection has deaths passing births in 2099 and staying above them from then on.

The median age was 20.4 in 1950 and 20.3 in 2023; the projection has 38.4 in 2100. 3.2% of people were 65 or older in 2023, against 15.5% projected for 2100. The working-age population (15–64) is projected to peak in 2087 at 10.6 million.

By size it is the 102nd country in 2023; the projection puts it 91st in 2050 and 87th in 2100. In the medium projection it overtakes Belarus in 2026, Austria in 2027 and Switzerland in 2027. It is overtaken by the Republic of the Congo in 2073, the Central African Republic in 2074 and Mauritania in 2091.

Population, mid-2023: 8,460,512
Rank by population, 2023: 102 of 236
Share of the world, 2023: 0.10%
Change in a year, mid-2022 to mid-2023: +2.22% · +183,705 people
People per km² of land, 2023: 117
Land area, 2023: 72,180 km²
Births, 2023: 258,903
Deaths, 2023: 70,116
Net migration, 2023: −4,000
Children per woman, 2023: 3.79
Median age, 2023: 20.3 years
Life expectancy at birth, 2023: 61.8 years
In a city, 2025: 38 of every 100
Population, mid-1950: 1,999,624
Projected, mid-2050: 12,948,325
Projected, mid-2100: 15,934,256

SLE · 1950–2100 · total population

Population, 1950–2100

peak 2092estimates | projections010 m20 m30 m40 m1950197520002025205020752100

estimate projection, up to the bottom of the 95% range 95% range medium projection. Each column is the population on 1 January of one year; the paper rules cut it into equal cells.

Show the numbers: Sierra Leone, 1950–2100

Sierra Leone: population on 1 January, births, deaths, fertility and life expectancy, 1950–2100
Year	Kind	Population, 1 Jan	95% range	Births	Deaths	Children per woman	Life expectancy
1950	estimate	1,987,938		95,629	68,972	6.09	28.9
1951	estimate	2,011,309		96,433	68,920	6.07	29.3
1952	estimate	2,035,244		96,996	68,809	6.03	29.7
1953	estimate	2,059,156		97,615	68,805	6.00	30.1
1954	estimate	2,082,465		99,440	69,002	6.05	30.5
1955	estimate	2,107,666		100,970	69,282	6.07	30.9
1956	estimate	2,134,112		102,573	69,661	6.10	31.3
1957	estimate	2,161,845		104,000	69,894	6.12	31.8
1958	estimate	2,190,655		105,481	70,303	6.13	32.1
1959	estimate	2,219,023		106,986	70,576	6.15	32.6
1960	estimate	2,251,028		108,883	70,692	6.17	33.1
1961	estimate	2,285,685		110,885	70,863	6.21	33.6
1962	estimate	2,322,768		112,687	71,084	6.22	34.2
1963	estimate	2,361,717		114,838	71,270	6.26	34.7
1964	estimate	2,402,798		116,849	71,362	6.29	35.3
1965	estimate	2,445,982		118,544	71,320	6.31	35.9
1966	estimate	2,491,351		120,599	71,115	6.34	36.6
1967	estimate	2,537,925		122,799	71,066	6.38	37.3
1968	estimate	2,586,843		124,450	71,322	6.38	37.8
1969	estimate	2,636,220		126,323	71,556	6.39	38.2
1970	estimate	2,686,510		128,475	71,963	6.41	38.6
1971	estimate	2,738,062		130,657	72,173	6.43	39.1
1972	estimate	2,788,383		132,795	72,515	6.45	39.5
1973	estimate	2,840,393		135,213	72,772	6.47	40.0
1974	estimate	2,893,517		138,506	73,150	6.53	40.4
1975	estimate	2,947,401		140,735	73,173	6.55	41.0
1976	estimate	3,001,912		142,940	73,433	6.55	41.4
1977	estimate	3,055,728		145,387	73,722	6.57	41.8
1978	estimate	3,114,981		148,361	74,230	6.59	42.2
1979	estimate	3,176,053		150,749	74,758	6.58	42.5
1980	estimate	3,238,945		153,258	75,327	6.56	42.8
1981	estimate	3,305,233		156,218	76,108	6.55	43.1
1982	estimate	3,372,647		159,450	76,993	6.56	43.3
1983	estimate	3,443,719		162,737	78,107	6.57	43.5
1984	estimate	3,519,572		166,518	79,446	6.59	43.6
1985	estimate	3,597,945		169,929	81,059	6.59	43.6
1986	estimate	3,678,930		173,760	82,859	6.60	43.5
1987	estimate	3,777,829		178,462	84,229	6.61	43.8
1988	estimate	3,881,607		182,564	86,220	6.59	43.8
1989	estimate	3,987,428		186,584	88,286	6.57	43.7
1990	estimate	4,080,646		190,874	90,098	6.57	43.7
1991	estimate	4,313,011		201,797	96,319	6.55	43.3
1992	estimate	4,179,523		195,771	92,520	6.55	43.5
1993	estimate	4,153,209		195,162	91,845	6.57	43.4
1994	estimate	4,161,050		195,206	93,721	6.56	42.8
1995	estimate	4,185,160		195,444	94,559	6.55	42.6
1996	estimate	4,173,198		195,188	91,046	6.55	43.5
1997	estimate	4,225,222		196,834	91,401	6.53	43.6
1998	estimate	4,282,209		198,896	94,989	6.50	42.7
1999	estimate	4,309,361		199,179	96,883	6.42	42.0
2000	estimate	4,326,726		199,261	88,507	6.36	44.8
2001	estimate	4,520,497		206,540	89,895	6.30	45.5
2002	estimate	4,864,934		220,140	93,714	6.23	46.2
2003	estimate	5,077,935		225,091	94,776	6.09	46.8
2004	estimate	5,277,439		227,428	94,769	5.92	47.5
2005	estimate	5,433,994		230,908	93,670	5.81	48.3
2006	estimate	5,569,431		235,141	91,015	5.74	49.5
2007	estimate	5,679,501		236,058	90,314	5.64	50.0
2008	estimate	5,819,204		239,259	89,406	5.56	50.7
2009	estimate	5,970,241		241,335	88,668	5.45	51.3
2010	estimate	6,141,052		243,404	88,061	5.33	51.9
2011	estimate	6,304,376		246,024	87,166	5.21	52.6
2012	estimate	6,470,126		247,465	86,552	5.06	53.2
2013	estimate	6,632,034		245,736	84,466	4.87	54.0
2014	estimate	6,796,069		244,938	84,803	4.70	54.3
2015	estimate	6,956,701		243,911	81,635	4.55	55.5
2016	estimate	7,118,609		246,383	77,596	4.47	56.9
2017	estimate	7,292,048		249,479	76,224	4.39	57.8
2018	estimate	7,466,550		251,868	73,100	4.29	59.1
2019	estimate	7,642,576		253,675	72,604	4.19	59.6
2020	estimate	7,821,406		254,755	73,738	4.08	59.7
2021	estimate	8,003,710		256,143	72,819	3.98	60.3
2022	estimate	8,185,494		257,167	70,547	3.88	61.3
2023	estimate	8,368,119		258,903	70,116	3.79	61.8
2024	estimate	8,552,905		260,194	70,955	3.70	62.0
2025	projection	8,731,140	8.5–8.9 million	260,288	71,671	3.61	62.1
2026	projection	8,908,448	8.5–9.3 million	261,328	72,457	3.53	62.3
2027	projection	9,085,041	8.6–9.6 million	262,858	73,294	3.47	62.5
2028	projection	9,264,344	8.6–10.0 million	262,197	74,119	3.37	62.7
2029	projection	9,433,706	8.6–10.3 million	262,112	74,942	3.30	62.9
2030	projection	9,607,929	8.6–10.6 million	262,783	75,892	3.23	63.0
2031	projection	9,781,787	8.7–10.9 million	263,544	76,862	3.18	63.2
2032	projection	9,958,810	8.7–11.3 million	264,327	77,942	3.12	63.3
2033	projection	10,135,589	8.8–11.6 million	264,986	78,994	3.07	63.5
2034	projection	10,306,439	8.8–11.9 million	265,313	80,086	3.02	63.7
2035	projection	10,476,542	8.9–12.2 million	265,551	81,185	2.97	63.8
2036	projection	10,649,793	8.9–12.6 million	265,731	82,372	2.92	64.0
2037	projection	10,818,902	9.0–12.9 million	265,643	83,546	2.88	64.2
2038	projection	10,985,635	9.1–13.2 million	265,570	84,820	2.84	64.3
2039	projection	11,146,665	9.0–13.5 million	265,209	86,101	2.79	64.5
2040	projection	11,313,457	9.1–13.8 million	265,159	87,547	2.76	64.6
2041	projection	11,483,343	9.1–14.2 million	265,164	88,963	2.72	64.7
2042	projection	11,649,090	9.3–14.7 million	265,281	90,418	2.69	64.9
2043	projection	11,808,493	9.4–15.1 million	264,800	91,935	2.65	65.0
2044	projection	11,967,381	9.4–15.5 million	264,281	93,468	2.62	65.2
2045	projection	12,131,471	9.4–15.8 million	263,988	95,082	2.58	65.3
2046	projection	12,286,290	9.6–16.1 million	263,430	96,731	2.56	65.5
2047	projection	12,440,625	9.6–16.4 million	262,849	98,407	2.53	65.6
2048	projection	12,584,887	9.7–16.9 million	262,066	100,114	2.50	65.7
2049	projection	12,734,336	9.7–17.3 million	261,540	101,880	2.48	65.9
2050	projection	12,875,949	9.7–17.7 million	260,819	103,727	2.45	66.0
2051	projection	13,020,701	9.7–17.9 million	260,280	105,700	2.43	66.1
2052	projection	13,166,224	9.8–18.4 million	259,619	107,668	2.41	66.2
2053	projection	13,305,825	9.8–18.7 million	258,664	109,616	2.38	66.4
2054	projection	13,439,767	9.8–19.0 million	257,746	111,587	2.36	66.5
2055	projection	13,564,775	9.8–19.4 million	256,282	113,566	2.34	66.6
2056	projection	13,693,454	9.9–19.7 million	255,390	115,688	2.32	66.8
2057	projection	13,816,904	9.8–20.1 million	254,318	117,809	2.30	66.9
2058	projection	13,935,625	9.8–20.6 million	253,360	119,958	2.28	67.0
2059	projection	14,052,289	9.8–21.1 million	252,294	122,110	2.26	67.2
2060	projection	14,163,637	9.8–21.6 million	251,389	124,318	2.25	67.3
2061	projection	14,275,122	9.8–21.8 million	250,400	126,603	2.23	67.4
2062	projection	14,379,728	9.8–22.2 million	249,300	128,937	2.22	67.5
2063	projection	14,491,042	9.8–22.6 million	248,000	131,341	2.20	67.7
2064	projection	14,588,742	9.8–23.1 million	246,693	133,678	2.18	67.8
2065	projection	14,684,690	9.8–23.6 million	245,526	135,986	2.17	67.9
2066	projection	14,781,210	9.8–24.1 million	244,713	138,388	2.16	68.0
2067	projection	14,877,132	9.8–24.5 million	243,843	140,926	2.15	68.2
2068	projection	14,972,047	9.8–24.8 million	242,928	143,438	2.13	68.3
2069	projection	15,059,751	9.7–25.1 million	241,512	145,953	2.12	68.4
2070	projection	15,139,701	9.6–25.6 million	239,853	148,313	2.10	68.5
2071	projection	15,216,245	9.5–25.9 million	238,608	150,832	2.09	68.7
2072	projection	15,287,258	9.6–26.2 million	237,323	153,311	2.08	68.8
2073	projection	15,356,727	9.6–26.8 million	236,571	155,646	2.07	68.9
2074	projection	15,423,671	9.5–27.5 million	235,115	158,189	2.06	69.0
2075	projection	15,478,184	9.5–28.3 million	233,333	160,529	2.05	69.2
2076	projection	15,537,546	9.3–28.5 million	231,812	163,003	2.04	69.3
2077	projection	15,592,090	9.3–29.0 million	230,358	165,507	2.03	69.4
2078	projection	15,642,619	9.3–29.3 million	229,140	167,913	2.02	69.5
2079	projection	15,691,402	9.2–30.0 million	227,641	170,304	2.01	69.6
2080	projection	15,732,917	9.1–30.2 million	226,340	172,478	2.00	69.7
2081	projection	15,770,748	9.0–30.7 million	225,067	174,813	1.99	69.8
2082	projection	15,810,338	9.0–31.2 million	223,850	177,012	1.99	70.0
2083	projection	15,846,027	8.9–31.5 million	222,388	179,295	1.98	70.0
2084	projection	15,879,328	8.9–31.7 million	221,002	181,243	1.97	70.2
2085	projection	15,902,740	8.7–32.3 million	219,564	183,209	1.96	70.3
2086	projection	15,923,862	8.6–32.8 million	217,911	185,129	1.95	70.4
2087	projection	15,950,626	8.6–32.9 million	216,763	186,936	1.95	70.5
2088	projection	15,966,654	8.5–33.4 million	215,606	188,646	1.94	70.6
2089	projection	15,980,267	8.5–33.7 million	214,165	190,262	1.93	70.7
2090	projection	15,991,789	8.4–34.2 million	212,969	191,871	1.93	70.9
2091	projection	16,001,427	8.3–34.4 million	211,719	193,462	1.92	71.0
2092	projection	16,008,235	8.3–34.6 million	210,212	194,964	1.91	71.1
2093	projection	16,011,037	8.2–34.9 million	208,965	196,268	1.91	71.2
2094	projection	16,006,377	8.1–35.5 million	207,468	197,590	1.90	71.3
2095	projection	16,006,775	8.1–35.7 million	206,261	198,749	1.90	71.5
2096	projection	15,998,230	8.0–36.1 million	204,856	199,937	1.89	71.6
2097	projection	15,987,571	7.9–36.2 million	203,620	201,055	1.89	71.7
2098	projection	15,972,851	7.8–36.6 million	202,186	201,962	1.89	71.8
2099	projection	15,959,887	7.6–37.1 million	200,618	202,950	1.88	71.9
2100	projection	15,945,184	7.5–37.6 million	199,024	203,889	1.87	72.0

Show the numbers: Sierra Leone, mid-2026, by single year of age

Sierra Leone: population by single year of age, mid-2026
Age	Male	Female
0	125,337	122,482
1	121,098	118,774
2	119,133	116,970
3	117,530	115,446
4	116,248	114,223
5	115,032	113,093
6	113,738	111,902
7	112,338	110,620
8	110,658	109,084
9	108,736	107,322
10	106,754	105,506
11	105,604	104,465
12	105,197	104,098
13	104,930	103,838
14	104,166	103,082
15	102,472	101,406
16	100,667	99,601
17	98,841	97,756
18	96,512	95,415
19	94,072	92,993
20	91,466	90,464
21	88,891	88,008
22	87,368	86,600
23	86,162	85,274
24	84,218	83,021
25	81,808	80,722
26	79,286	78,667
27	76,730	76,412
28	74,188	73,956
29	71,483	71,500
30	68,576	69,006
31	66,269	66,630
32	64,526	64,471
33	62,452	62,188
34	60,193	59,906
35	58,058	57,789
36	56,031	55,770
37	54,214	53,956
38	52,562	52,305
39	50,793	50,540
40	48,920	48,692
41	47,126	46,944
42	45,338	45,217
43	43,544	43,508
44	41,796	41,872
45	40,074	40,293
46	38,442	38,821
47	36,890	37,441
48	35,304	36,018
49	33,720	34,574
50	32,260	33,233
51	30,892	31,970
52	29,428	30,606
53	27,962	29,235
54	26,654	28,026
55	25,403	26,872
56	24,178	25,745
57	22,998	24,655
58	21,892	23,633
59	20,766	22,589
60	19,604	21,500
61	18,500	20,464
62	17,408	19,437
63	16,280	18,361
64	15,182	17,306
65	14,113	16,269
66	13,050	15,224
67	12,034	14,215
68	11,066	13,240
69	10,135	12,284
70	9,225	11,330
71	8,343	10,383
72	7,478	9,433
73	6,682	8,545
74	5,973	7,746
75	5,317	7,001
76	4,554	6,047
77	3,904	5,270
78	3,658	4,974
79	3,328	4,520
80	2,842	3,914
81	2,408	3,370
82	1,987	2,826
83	1,602	2,318
84	1,272	1,875
85	996	1,500
86	770	1,186
87	586	926
88	436	708
89	316	527
90	222	382
91	153	273
92	103	192
93	68	132
94	44	88
95	28	57
96	16	36
97	10	22
98	6	14
99	3	8
100+	4	10

SLE · 1950–2100 · every age, every year

Sierra Leone, every age in every year

Each column is a year and each row an age; the denser the ink in a cell, the more people. Everyone born in the same year climbs one 45° diagonal, so famines, baby booms and migration show up as streaks. Select a cell to follow its generation.

SLE · ages 15–64

Who does the work in Sierra Leone

On the UN's projection, Sierra Leone will have the most working-age people it ever has in 2087: 10,631,000 people aged 15–64. In 2023 it had 4,929,230.

100 aged 15–64

66 children

6 aged 65+

aged 15–64 children under 15 aged 65 and over

How to read this: the orange squares are 100 people aged 15–64 in 2023, and the rows below are how many children (teal) and how many people aged 65 or older (violet) lived alongside them.

Fewer than 50 dependants live alongside every 100 people aged 15–64 in 34 years: 2053–2086.

fewer than 50 dependants per 100 the same, projected 50 or more

How to read this: one stripe a year from 1950 to 2100. A stripe takes colour in a year when fewer than 50 dependants live alongside every 100 people of working age, and stays grey otherwise; hatching means the year is projected.

How every country compares

SLE · arrivals minus departures

Who arrives in Sierra Leone, and who leaves

In 2020–2025 Sierra Leone loses 5,109 people a year: everyone who arrives, minus everyone who leaves. The age at which that happens most is 20–24, at 951 a year more leaving than arriving.

one square = 100 people a year

020406080+

more arrive than leave more leave than arrive

How to read this: left to right is age, from babies to 100. Blue squares above the line are ages at which more people arrive than leave; orange squares below it, ages at which more leave than arrive. These are the UN's projection for 2020–2025. There is no record of migration by age before 2020.

Across the counted years, 1950 to 2023, its biggest single-year gain was 227,791 (2001); its biggest loss, 238,965 (1991).

In 2024, 49,997 people living in Sierra Leone had been born in another country, fewer than 1 of every 100 people there, against 5 in 1990.

How migration works everywhere

SLE · births by the mother's age · 1950–2100

Who has the babies in Sierra Leone

Of every 100 babies born in Sierra Leone in 2023, 17 had a mother under 20, 69 a mother aged 20 to 34 and 14 a mother aged 35 or older. In 1950 it was 23 under 20 and 16 aged 35 or older.

1950
23 · 61 · 16

2023
17 · 69 · 14

2050 · projected
12 · 73 · 15

The mother's age: under 20 20 to 34 35 or older projected

How to read this: each block is 100 babies born in that year, one square each, coloured by how old the mother was. The numbers under a block are the three groups, youngest mothers first.

Babies born, 2023: 258,903
Average age when women have a baby: 28.6 years; 28.3 in 1950
Babies a year per 1,000 girls aged 15–19: 94; 197 in 1950

Babies by the mother's age, 1950–2100

Babies born in Sierra Leone by the mother's age
Mother's age	1950	1975	2000	2023	2050 projected	2100 projected
10–14	1,874	3,854	5,830	1,658	293	39
15–19	19,550	28,245	36,204	42,917	31,392	10,261
20–24	23,116	33,345	48,216	73,100	71,717	39,362
25–29	21,695	29,742	40,227	60,824	67,191	57,746
30–34	13,732	21,496	31,767	43,537	52,298	55,532
35–39	9,648	14,746	22,078	25,185	29,276	29,738
40–44	4,741	6,762	11,375	9,116	7,177	5,659
45–49	1,217	2,407	3,379	2,449	1,413	668
50–54	56	138	185	117	62	19
All babies	95,629	140,735	199,261	258,903	260,819	199,024

The UN's births for each year, split by the mother's age in the UN's own proportions.

SLE · healthy years · 2021

Years in good health in Sierra Leone

In Sierra Leone, WHO puts the healthy years a newborn could expect in 2021 at 53.1 (95% range 51.9–54.4), out of 61.0 in all. The years in less than full health come to 7.9, below the world's 9.5: shorter lives leave fewer years in which to be ill.

Women

53.0 in full health, 8.9 not: 61.9 years

Men

53.2 in full health, 7.0 not: 60.2 years

a year in full health a year in less than full health

How to read this: each square is a year of life, each row ten years; filled squares are years in full health, rounded to whole years.

Women: 53.0 healthy years of 61.9. Men: 53.2 of 60.2.

SLE · forced from home · end of 2025

Displacement in Sierra Leone

At the end of 2025, 17,267 people from Sierra Leone were living in another country. UNHCR records nobody displaced inside it, and nobody who had crossed a border into it.

Sierra Leone nationals abroad17,267

crossed a border

How to read this: one square stands for 500 people. The row is people from Sierra Leone living in another country, wherever they are.

In 2025, 3,081 people from Sierra Leone asked for asylum in another country. Of every 100 people from Sierra Leone whose claims were decided that year, 28 were given protection. Who asks for asylum, and who is given it

How the world's displacement is counted

SLE · of every 100 people

How people live in Sierra Leone

Of every 100 people in Sierra Leone in 2025, 38 lived in a city, 20 in a town or suburb and 42 in the countryside.

cities towns and suburbs rural areas

60.8 of every 100 have no electricity at home (2024). 74.9 of every 100 do not use the internet (2024).

How to read this: 100 squares, one for every 100th person, coloured by where they live, as the key says. The same rule is used in every country.

How the world's people live

SLE · adults 25 and over · 2020

How far people in Sierra Leone went in school

Of every 100 adults in Sierra Leone in 2020, 54 never went to school and 16 finished upper secondary or went further.

54 never went to school 8 some primary 11 finished primary 11 finished lower secondary 9 finished upper secondary 7 studied after school

The young went further: 32 of every 100 women aged 25–29 never went to school, against 86.6 of every 100 aged 60–64 (men: 20 against 67.7).

Its people aged 15 to 64 are projected to be most numerous in 2080; the ones who finished upper secondary are still growing in 2100.

How to read this: every adult here as one of 100 squares. The stronger the colour, the further that person went in school (the Wittgenstein Centre, 2020).

How far the world's people went in school

SLE · cities · 2025

Cities in Sierra Leone

Sierra Leone had 11 cities in 2025, home to 3.3 million people. The largest, Freetown, holds 22 of every 100 people in Sierra Leone.

Freetown1,935,761
Bo345,988
Kenema249,485
Makeni200,865
Koidu Town140,949
Mahera99,588
Kambia78,176
Port Loko77,440
Magburaka75,708
Mile 9173,321

How to read this: the 10 biggest cities here in 2025, drawn on a single scale so the bars can be compared. Each is a built-up area on the UN's rule rather than a city government's patch.

All the world's cities

Apparatus

Sources and method

Every figure on this page comes from the UN's World Population Prospects 2024: the annual country tables (estimates to 2023, projections with 95% intervals from 2024), and the population by single year of age and sex for the pyramid.

The censuses, surveys and registers behind the UN's estimates for Sierra Leone are listed, source by source, on the UN's own data sources page.

Sources: UN WPP 2024 · World Bank · UNHCR · country code lists · UN WUP 2025 · Wittgenstein Centre · WHO GHO · flag-icons · Natural Earth. Every source, its licence and how to cite it →

Checked before it was drawn

Verified 2026-09-30 · 73 canaries The pyramid for every year was checked against the published total. What that stamp counts, and what every page here has to pass before it can be built: how this site checks its figures.