Zaujala ma este jedna vec - ako sa vyvijala velkost populacie aj pred rokom 1900, na wiki pisu toto:

Estimated world population at various dates (in millions)[citation needed]
http://en.wikipedia.org/wiki/World_population
Year Population (World)
70,000 BC < 0.015
10,000 BC 1
9000 BC 3
8000 BC 5
7000 BC 7
6000 BC 10
5000 BC 15
4000 BC 20
3000 BC 25
2000 BC 35
1000 BC 50
500 BC 100
AD 1 200
1000 310
1750 791
1800 978
1850 1,262
1900 1,65
1950 2,519
1955 2,756
1960 2,982
1965 3,335
1970 3,692
1975 4,068
1980 4,435
1985 4,831
1990 5,263
1995 5,674
2000 6,07
2005 6,454
2010 6,972
Year World