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Year
-- Number of Grandparents
1950
– 4
1920
– 8
1890
– 16
1860
– 32
1830
– 64
1800
– 128
1770
– 256
1740
– 512
1710
– 1024
1680
– 2048
1650
– 4096
1620
– 8192
1590
– 16,284
1560
– 32,568
1530
– 65,136
1500
– 130,272
1470
– 260,544
1440
– 521,088
1410
– 1,042,176
1380
– 2,084,352
1350
– 4,168,704
1320
– 8,337,408
1290
– 16,674,816
1260
– 33,349,632
1230
– 66,699,264
1200
– 133,398,528
1170
– 266,797,056
1140
– 533,594,112
1110
– 1,067,188,224, aka 1.06 billion
1080
– 2,134,376,448, aka 2.1 billion
1050
– 4,268,752,896, aka 4.2 billion
1020
– 8,537,505,792, aka 8.5 billion
So in the year
1020, you would have over 8 billion grandparents to look up. Of
course there weren't even close to being 8 billion people in the
world in 1020. So either everyone was your grandparent, or we are
the result of lots of inbreeding. Also remember that your current
surname comes from only one of those people.
Estimates of
world population by year is provided below, according to the United
Nations, Population Division:
2000
-- 6 billion
1999
-- 5.98 billion
1990
-- 5.27 billion
1980
-- 4.44 billion
1970
-- 3.7 billion
1960
-- 3.02 billion
1950
-- 2.52 billion
1940
-- 2.30 billion
1930
-- 2.07 billion
1920
-- 1.86 billion
1910
-- 1.75 billion
1900
-- 1.65 billion
1850
-- 1.26 billion
1800
-- 980 million
1750
-- 790 million
1500
-- 500 million
1250
-- 400 million
1000
-- 300 million
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