Year Measure
1800 639.8
1801 640.1
1802 640.3
1803 640.6
1804 640.8
1805 641.1
1806 641.3
1807 641.6
1808 641.8
1809 642.1
1810 642.3
1811 642.6
1812 642.8
1813 643.1
1814 643.3
1815 643.6
1816 643.8
1817 644.1
1818 644.3
1819 644.6
1820 644.8
1821 648.5
1822 652.2
1823 655.9
1824 659.6
1825 663.3
1826 667.1
1827 670.9
1828 674.7
1829 678.5
1830 682.4
1831 686.3
1832 690.2
1833 694.1
1834 698
1835 702
1836 706
1837 710
1838 714
1839 718.1
1840 722.1
1841 726.2
1842 730.4
1843 734.5
1844 738.7
1845 742.9
1846 747.1
1847 751.3
1848 755.6
1849 759.9
1850 764.2
1851 768.5
1852 772.9
1853 777.3
1854 781.7
1855 786.1
1856 790.6
1857 795.1
1858 799.6
1859 804.1
1860 808.7
1861 813.3
1862 817.9
1863 822.5
1864 827.2
1865 831.9
1866 836.6
1867 841.4
1868 846.2
1869 851
1870 855.8
1871 860.7
1872 865.5
1873 870.5
1874 875.4
1875 880.4
1876 885.4
1877 890.4
1878 895.4
1879 900.5
1880 905.6
1881 910.8
1882 915.9
1883 921.1
1884 926.4
1885 931.6
1886 895.1
1887 1046
1888 1005
1889 934.3
1890 929.9
1891 851.2
1892 931.2
1893 1055
1894 1198
1895 1108
1896 1220
1897 1199
1898 1230
1899 1304
1900 1275
1901 1306
1902 1418
1903 1320
1904 1458
1905 1290
1906 1232
1907 1183
1908 1291
1909 1340
1910 1429
1911 1319
1912 1424
1913 1495
1914 1427
1915 1468
1916 1304
1917 1144
1918 700
1919 603.1
1920 605.1
1921 553.5
1922 642.1
1923 739.1
1924 935.7
1925 1169
1926 1311
1927 1365
1928 1435
1929 1450
1930 1515
1931 1527
1932 1503
1933 1558
1934 1700
1935 1943
1936 2074
1937 2244
1938 2237
1939 2326
1940 2227
1941 2184
1942 2142
1943 2100
1944 2059
1945 2019
1946 1980
1947 2199
1948 2483
1949 2710
1950 2933
1951 2894
1952 3027
1953 3104
1954 3198
1955 3409
1956 3667
1957 3674
1958 3879
1959 3765
1960 4046
1961 4203
1962 4246
1963 4087
1964 4552
1965 4752
1966 4926
1967 5090
1968 5335
1969 5359
1970 5717
1971 5812
1972 5787
1973 6214
1974 6404
1975 6432
1976 6746
1977 6919
1978 7108
1979 7093
1980 7122
1981 7207
1982 7404
1983 7659
1984 7770
1985 7855
1986 8196
1987 8323
1988 8525
1989 8704
1990 8531
1991 8388
1992 7537
1993 6928
1994 6101
1995 5458
1996 5609
1997 6251
1998 6782
1999 7021
2000 7439
2001 7801
2002 8203
2003 8772
2004 9783
2005 10700
2006 11820
2007 12870
2008 14450
2009 14500
2010 15650
2011 16600
2012 16920
2013 17070
2014 17430
2015 17950
2016 18540
2017 19130
2018 19760
2019 20410