historical population growth of the world II
year	population	source*
0	300,000,000	Durand
1000	310,000,000	Durand
1250	400,000,000	Durand
1500	500,000,000	Durand
1750	790,000,000	D & C
1800	980,000,000	D & C
1850	1,260,000,000	D & C
1900	1,650,000,000	D & C
1910	1,750,000,000	Interp.
1920	1,860,000,000	WPP63
1930	2,070,000,000	WPP63
1940	2,300,000,000	WPP63
1950	2,520,000,000	WPP94
1960	3,020,000,000	WPP94
1970	3,700,000,000	WPP94
1980	4,450,000,000	WPP94
1990	5,300,000,000	WPP94
1994	5,630,000,000	WPP94
2000	6,230,000,000	WPP94
2025	8,470,000,000	WPP94
2050	10,020,000,000	LR
2100	11,190,000,000	LR
2150	11,540,000,000	LR
stabilization (just after 2200)	11,600,000,000	LR

* Sources
Durand: J.D. Durand, 1974. Historical Estimates of World Population: An Evaluation (University of Pennsylvania, Population Studies Center, Philadelphia), mimeo. D & C: United Nations, 1973. The Determinants and Consequences of Population Trends, Vol. 1 (United Nations, New York). WPP63: United Nations, 1966. World Population Prospects as Assessed in 1963 (United Nations, New York). WPP94: United Nations, 1993. World Population Prospects: The 1994 Revision (United Nations, New York) LR: United Nations, 1992. Long-range World Population Projection: Two Centuries of Population Growth, 1950-2150 (United Nations, New York). Interp: Estimate interpolated from adjacent population estimates.