User:Emijrp/Systemic bias/Contemporary bias

72% of all the biographies in English Wikipedia are about people who lived in the 20th century (1901-2000). 99.66% lived in the 2nd millennium (1001-2000).

The most populated categories are 1980s years, with about 9,000+ biographies each one.

If we use that level of notability and completeness, from year 1 to year 2000 we would have 9000 * 2000 = 18,000,000 biographies. Currently we have only 728,971 biographies (4.05% of 18M).

Summary

The biographies numbers are the births categories sum for that date range.

Years	Biographies (%)	World population est. (in millions)		Notability (bios per million)
		lower	upper	max	min
1–100	133 (0.02%)	170	400	0.78	0.33
101–200	179 (0.02%)
201–300	188 (0.03%)	190	256	0.99	0.73
301–400	212 (0.03%)
401–500	192 (0.03%)	190	206	1.01	0.93
501–600	291 (0.04%)	190	206	1.53	1.41
601–700	318 (0.04%)	200	206	1.59	1.54
701–800	344 (0.05%)	207	210	1.66	1.64
801–900	336 (0.05%)	220	224	1.53	1.5
901–1000	454 (0.06%)	226	240	2.01	1.89
1001–1100	523 (0.07%)	254	345	2.06	1.52
1101–1200	928 (0.13%)	301	320	3.08	2.9
1201–1300	1357 (0.19%)	360	450	3.77	3.02
1301–1400	1586 (0.22%)	360	443	4.41	3.58
1401–1500	2550 (0.35%)	350	374	7.29	6.82
1501–1600	7188 (0.99%)	425	540	16.91	13.31
1601–1700	10982 (1.51%)	470	579	23.37	18.97
1701–1800	29929 (4.11%)	600	961	49.88	31.14
1801–1900	143359 (19.67%)	813	1402	176.33	102.25
1901–2000	527922 (72.42%)	1550	6115	340.59	86.33
	Total = 728,971 (100%)