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A list of 'data for historical human population' of planet Earth from various sources is recorded here for reference (see e.g. World population).

Year	UN Medium	Census.gov	PRB[1]	about.com	Tanton	Kremer	Ponting	Article
Reference	[2]	[3]	[4]	[5]	[6]	[7]	[8]	[9]
-1,000,000						125,000
-50,000
-10,000		5,002,000				4,000,000	4,000,000
-8000		5,000,000	5,000,000					5,000,000
-6500		7,500,000
-5000		12,500,000					4,000,000
-4000		7,000,000					7,000,000
-3000		14,000,000					14,000,000
-2000		27,000,000					27,000,000
-1000		50,000,000				50,000,000	50,000,000	50,000,000
-500		100,000,000					100,000,000	100,000,000
-400		162,000,000
-200		265,500,000					200,000,000
0 (1 AD)		370,000,000	300,000,000	200,000,000	150,000,000	170,000,000		300,000,000
200		223,000,000					200,000,000
400		198,000,000					220,000,000
500		198,000,000					190,000,000
600		203,000,000
700		208,500,000
800		222,000,000
900		233,000,000
1000		299,500,000		275,000,000		265,000,000	265,000,000	310,000,000
1100		310,500,000					320,000,000
1200		405,000,000	450,000,000				350,000,000
1250		408,000,000
1300		396,000,000					400,000,000
1340		443,000,000
1350					300,000,000
1400		362,000,000					350,000,000
1500		482,500,000		450,000,000		425,000,000
1600		562,000,000	500,000,000				545,000,000
1650		507,500,000
1700		639,500,000			600,000,000		610,000,000
1750		795,000,000	795,000,000	700,000,000		720,000,000		791,000,000
1800		969,000,000			900,000,000		900,000,000	978,000,000
1802								1,000,000,000
1825							1,000,000,000
1850		1,265,000,000	1,265,000,000	1,200,000,000		1,200,000,000		1,262,000,000
1900		1,656,000,000	1,656,000,000	1,600,000,000	1,600,000,000	1,800,000,000		1,650,000,000
1910		1,750,000,000
1920		1,860,000,000
1925							2,000,000,000
1928								2,000,000,000
1930		2,070,000,000
1940		2,300,000,000
1950	2,519,470,000	2,478,500,000	2,516,000,000	2,550,000,000	2,400,000,000	2,500,000,000		2,518,629,000
1955	2,757,399,000			2,800,000,000				2,755,823,000
1960	3,000,000,000			3,000,000,000			3,000,000,000	2,981,659,000
1961								3,000,000,000
1965	3,337,974,000			3,300,000,000				3,334,874,000
1970	3,696,588,000			3,700,000,000				3,692,492,000
1974								4,000,000,000
1975	4,073,740,000			4,000,000,000			4,000,000,000	4,068,109,000
1980	4,442,295,000			4,500,000,000				4,434,682,000
1985	4,843,947,000			4,850,000,000	5,000,000,000			4,830,979,000
1987								5,000,000,000
1988							5,000,000,000
1990	5,279,519,000			5,300,000,000			5,200,000,000	5,263,593,000
1991							5,400,000,000
1992							5,467,000,000
1995	5,692,353,000		5,760,000,000	5,700,000,000				5,674,380,000
1999								6,000,000,000
2000	6,085,572,000			6,100,000,000		6,000,000,000		6,070,581,000
2002			6,215,000,000
2005	6,464,750,000			6,450,000,000				6,453,628,000
2006			[10] 6,555,000,000					6,500,000,000
2010	[11] 6,842,923,000			6,800,000,000				6,830,283,000
2015	[12] 7,219,431,000							7,197,247,000
2020	[13] 7,577,889,000			7,500,000,000	8,000,000,000			7,540,237,000
2025	[14] 7,905,239,000		7,940,000,000					7,851,455,000
2030	[15] 8,199,104,000			8,100,000,000				8,130,149,000
2035	[16] 8,463,265,000							8,378,184,000
2040	[17] 8,701,319,000			8,600,000,000				8,593,591,000
2045	[18] 8,907,417,000							8,774,394,000
2050	[19] 9,075,903,000		9,243,000,000	9,000,000,000				8,918,724,000

Contents

References

References

1. Population Reference Bureau
2. Medium variant from esa.un.org/unpp
3. Average of high and low data from the U.S. Census Bureau's Historical Estimates of World Population summing up data from Biraben, Durand, Haub, McEvedyand Jones, Thomlinson, UN (1993), UN (1999), and USCB
4. Data from Population Reference Bureau DataFinder summary of PRB 2006 World Population Data Sheet (PDF) and from How Many People Have Ever Lived on Earth?
5. Data from about.com: World Population Growth
6. John H. Tanton, "End of the Migration Epoch," reprinted by The Social Contract, Vol IV, No 3 and Vol. V, No. 1, 1995.
7. Kremer (1993)
8. Ponting (1991): A Green history of the World
9. Data from World population
10. estimate is for mid-2006
11. high is 6,903,276,000 and low is 6,781,431,000 from esa.un.org/unpp
12. high is 7,382,434,000 and low is 7,054,584,000 from esa.un.org/unpp
13. high is 7,873,172,000 and low is 7,280,148,000 from esa.un.org/unpp
14. high is 8,336,867,000 and low is 7,471,426,000 from esa.un.org/unpp
15. high is 8,784,155,000 and low is 7,618,083,000 from esa.un.org/unpp
16. high is 9,237,907,000 and low is 7,712,423,000 from esa.un.org/unpp
17. high is 9,709,446,000 and low is 7,753,745,000 from esa.un.org/unpp
18. high is 10,184,739,000 and low is 7,741,810,000 from esa.un.org/unpp
19. high is 10,646,311,000 and low is 7,679,714,000 from esa.un.org/unpp