年份人数(百万) 1800 5.3 7.2 9.6 12.9 1840 17.1 1850 23.2 1860 1870 38.6 1910 1920 106.5 1930 123.2 1940 131.7 1960 1970 204 226.5 1990 251.4 2000 275
年份 人数(百万) 1800 5.3 1810 7.2 1820 9.6 1830 12.9 1840 17.1 1850 23.2 1860 31.4 1870 38.6 1880 50.2 1890 62.9 1900 76 1910 92 1920 106.5 1930 123.2 1940 131.7 1950 150.7 1960 179.3 1970 204 1980 226.5 1990 251.4 2000 275