Total World Population in Selected Years (in millions)
|
Year
|
Population
|
|
10000 BC
|
4
|
|
5000 BC
|
5
|
|
4000 BC
|
7
|
|
3000 BC
|
14
|
|
2000 BC
|
27
|
|
1000 BC
|
50
|
|
500 BC
|
100
|
|
200 BC
|
150
|
|
0
|
170
|
|
200 AD
|
190
|
|
400 AD
|
190
|
|
500 AD
|
190
|
|
600 AD
|
200
|
|
700 AD
|
210
|
|
800 AD
|
220
|
|
900 AD
|
240
|
|
1000 AD
|
265
|
|
1100 AD
|
320
|
|
1200 AD
|
360
|
|
1300 AD
|
360
|
|
1400 AD
|
350
|
|
1500 AD
|
425
|
|
1550 AD
|
480
|
|
1600 AD
|
545
|
|
1650 AD
|
545
|
|
1700 AD
|
610
|
|
1750 AD
|
720
|
|
1800 AD
|
900
|
|
1850 AD
|
1200
|
|
1875 AD
|
1325
|
|
1900 AD
|
1625
|
|
1925 AD
|
2000
|
|
1950 AD
|
2500
|
|
1975 AD
|
3900
|
|
1999 AD
|
6000
|
Source: Colin McEvedy and Richard Jones, Atlas of World Population History (Penguin, 1978)