World population estimates
Encyclopedia
A list of data for historical and projected human population
Population
A population is all the organisms that both belong to the same group or species and live in the same geographical area. The area that is used to define a sexual population is such that inter-breeding is possible between any pair within the area and more probable than cross-breeding with individuals...

of planet Earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...

 from various sources
Source text
A source text is a text from which information or ideas are derived. In translation, a source text is the original text that is to be translated into another language.-Description:...

 is recorded here for reference (see e.g. World population
World population
The world population is the total number of living humans on the planet Earth. As of today, it is estimated to be  billion by the United States Census Bureau...

 or Historical Estimates of World Population at U.S. Census Bureau). Estimates previous to the year 10,000 BC can be made only from archeological evidence.

The last point in which Homo sapiens sapiens hit a dangerous low
Population bottleneck
A population bottleneck is an evolutionary event in which a significant percentage of a population or species is killed or otherwise prevented from reproducing....

, coming close to extinction, was at year 70,000 BC during the Toba catastrophe
Toba catastrophe theory
The Toba supereruption was a supervolcanic eruption that occurred some time between 69,000 and 77,000 years ago at Lake Toba . It is recognized as one of the Earth's largest known eruptions...

. University of Illinois at Urbana-Champaign
University of Illinois at Urbana-Champaign
The University of Illinois at Urbana–Champaign is a large public research-intensive university in the state of Illinois, United States. It is the flagship campus of the University of Illinois system...

 estimates human world population (Homo sapiens in Africa) between 1,000 and 10,000 breeding couples.

The following table uses astronomical year numbering
Astronomical year numbering
Astronomical year numbering is based on AD/CE year numbering, but follows normal decimal integer numbering more strictly. Thus, it has a year 0, the years before that are designated with negative numbers and the years after that are designated with positive numbers...

 for dates, negative numbers corresponding roughly to the corresponding year BC (i.e. -10000 = 10,001 BC, etc.). The table starts counting around the Late Glacial Maximum period, in which ices retreated and humans started to spread into the northern hemisphere.
Year United States Census Bureau
United States Census Bureau
The United States Census Bureau is the government agency that is responsible for the United States Census. It also gathers other national demographic and economic data...


(2009)
Population Reference Bureau
Population Reference Bureau
The Population Reference Bureau is a private, nonprofit organization which informs people around the world about population, health and the environment for research or academic purposes...


(1973–2008)
United Nations Department of Economic and Social Affairs
United Nations Department of Economic and Social Affairs
The United Nations Department of Economic and Social Affairs is part of the United Nations Secretariat and is responsible for the follow-up to the major United Nations Summits and Conferences, as well as services to the United Nations Economic and Social Council and the Second and Third Committees...


(2008)
HYDE
(2006)
Maddison
Angus Maddison
Angus Maddison was a British economist and a world scholar on quantitative macroeconomic history, including the measurement and analysis of economic growth and development...


(2003)
Tanton
John Tanton
John H. Tanton, M.D., is a retired ophthalmologist from Petoskey, Michigan, and an influential activist in efforts aimed at reducing immigration levels in the United States. He was organizer and first chairman of the Federation for American Immigration Reform , a non-profit educational group that...


(1994)
Biraben
(1980)
McEvedy
Colin McEvedy
Colin Peter McEvedy , was a British psychiatrist, historian, demographer and non-fiction author. He was born in Salford, Lancashire and died in London....

 &
Jones (1978)
Thomlinson
(1975)
Durand
(1974)
Clark
Colin Clark
Colin Grant Clark was a British and Australian economist and statistician who worked in both the United Kingdom and Australia. He pioneered the use of the gross national product as the basis for studying national economies.-Biography:Colin Clark was born in London in 1905 and was educated at the...


(1967)
−10000 4,000,000 1,000,000 to 10,000,000
−8000 5,000,000 5,000,000 to 10,000,000
−5000 5,000,000 5,000,000 to 20,000,000
−4000 7,000,000
−3000 14,000,000
−2000 27,000,000
−1000 50,000,000
−500 100,000,000
−400 162,000,000
−200 231,000,000 150,000,000
0 or 1 300,000,000 300,000,000 230,820,000 150,000,000 255,000,000 170,000,000 200,000,000 270,000,000 to 330,000,000
14 256,000,000
200 256,000,000 190,000,000
350 254,000,000
400 206,000,000 190,000,000
500 206,000,000 190,000,000
600 206,000,000 200,000,000 237,000,000
700 207,000,000 210,000,000
800 224,000,000 220,000,000 261,000,000
900 226,000,000 240,000,000
1000 310,000,000 267,573,000 254,000,000 265,000,000 275,000,000 to 345,000,000 280,000,000
1100 301,000,000 320,000,000
1200 450,000,000 400,000,000 360,000,000 384,000,000
1250 400,000,000 416,000,000 350,000,000 to 450,000,000
1300 300,000,000 432,000,000 360,000,000 400,000,000
1340 443,000,000 378,000,000
1400 374,000,000 350,000,000
1500 500,000,000 438,428,000 460,000,000 425,000,000 440,000,000 to 540,000,000 427,000,000
1600 556,148,000 579,000,000 545,000,000 498,000,000
1650 500,000,000 545,000,000 500,000,000 516,000,000
1700 640,035,774 603,490,000 600,000,000 679,000,000 610,000,000 600,000,000 641,000,000
1710 662,378,306
1720 679,615,896
1730 689,283,580
1740 769,991,547
1750 795,000,000 791,000,000 824,276,110 770,000,000 720,000,000 700,000,000 735,000,000 to 805,000,000 731,000,000
1760 846,137,329
1770 864,445,832
1780 949,409,344
1790 982,617,842
1800 978,000,000 980,851,296 900,000,000 954,000,000 900,000,000 900,000,000 890,000,000
1810 1,045,073,963
1820 1,069,841,690 1,041,834,000
1830 1,138,392,564
1840 1,192,729,394
1850 1,265,000,000 1,262,000,000 1,244,327,949 1,241,000,000 1,200,000,000 1,200,000,000
1860 1,270,044,073
1870 1,309,430,136 1,271,915,000
1875 1,325,000,000
1880 1,397,685,022
1890 1,516,025,314
1900 1,656,000,000 1,650,000,000 1,633,848,213 1,563,622,000 1,600,000,000 1,633,000,000 1,625,000,000 1,600,000,000 1,650,000,000 to 1,710,000,000 1,668,000,000
1910 1,750,000,000 1,753,594,443
1913 1,791,091,000
1920 1,860,000,000 1,888,034,127 1,968,000,000
1925 2,000,000,000
1930 2,070,000,000 2,073,363,421 2,145,000,000
1940 2,300,000,000 2,299,541,939 2,340,000,000
1950 2,555,974,605 2,516,000,000 2,529,346,000 2,528,313,293 2,524,324,000 2,400,000,000 2,527,000,000 2,500,000,000 2,400,000,000 2,499,000,000
1955 2,780,923,093 2,763,453,000 2,767,727,535 2,766,471,000
1960 3,041,697,768 3,023,358,000 3,035,624,545 3,038,795,000
1962 3,138,922,062 3,155,862,958 3,132,691,000 3,036,000,000
1965 3,349,287,332 3,331,670,000 3,351,348,699 3,328,882,000
1966 3,419,728,217 3,420,389,193 3,397,631,000 3,288,000,000
1970 3,711,961,664 3,685,777,000 3,696,590,163 3,685,058,000 3,637,000,000 3,600,000,000 3,600,000,000 to 3,700,000,000
1973 3,941,550,996 3,923,325,629 3,916,489,000
1975 4,088,611,586 4,061,317,000 4,073,741,819 4,065,408,000 3,900,000,000 4,000,000,000
1980 4,452,547,522 4,437,609,000 4,442,296,596 4,435,598,000
1985 4,852,051,940 4,846,247,000 4,843,949,085 4,830,813,000 5,000,000,000
1990 5,283,687,429 5,290,452,000 5,279,521,283 5,259,502,000
1995 5,696,676,739 5,760,000,000 5,713,073,000 5,692,354,537 5,677,287,000
1998 5,932,090,951 5,930,407,103 5,914,930,000
1999 6,008,254,795 6,008,326,071 5,997,967,000
2000 6,083,550,220 6,115,367,000 6,085,574,386 6,071,144,000 5,750,000,000
2001 6,159,242,510 6,149,006,000
2002 6,234,361,771 6,215,000,000 6,238,183,321
2005 6,456,443,080 6,477,000,000 6,512,276,000 6,464,751,609
2006 6,530,984,631 6,555,000,000 6,540,285,038
2007 6,606,214,786 6,625,000,000 6,615,854,053
2008 6,681,112,529 6,705,000,000 6,691,483,957
2009 6,755,987,239
2010 6,830,586,985 6,908,688,000 6,842,925,208
2015 7,200,008,584 7,302,186,000 7,219,433,211
2020 7,557,514,266 7,674,833,000 7,577,890,552 8,000,000,000
2025 7,892,758,722 8,000,000,000 8,011,533,000 7,905,241,284
2030 8,202,205,367 8,308,895,000 8,199,106,302
2035 8,487,066,951 8,570,570,000
2040 8,748,743,446 8,801,196,000
2045 8,987,418,540 8,996,344,000
2050 9,202,458,484 9,352,000,000 9,149,984,000

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