Year Measure
1800 815.5
1801 815.6
1802 815.6
1803 815.7
1804 815.8
1805 815.9
1806 816
1807 816.1
1808 816.1
1809 816.2
1810 816.3
1811 816.4
1812 816.5
1813 816.6
1814 816.6
1815 816.7
1816 816.8
1817 816.9
1818 817
1819 817.1
1820 817.1
1821 821.6
1822 826
1823 830.4
1824 834.9
1825 839.4
1826 843.9
1827 848.5
1828 853
1829 857.6
1830 862.3
1831 866.9
1832 871.6
1833 876.3
1834 881
1835 885.7
1836 890.5
1837 895.3
1838 900.1
1839 905
1840 909.8
1841 914.7
1842 919.7
1843 924.6
1844 929.6
1845 934.6
1846 939.7
1847 944.7
1848 949.8
1849 954.9
1850 960.1
1851 965.2
1852 970.4
1853 975.7
1854 980.9
1855 986.2
1856 991.5
1857 996.9
1858 1002
1859 1008
1860 1013
1861 1019
1862 1024
1863 1030
1864 1035
1865 1041
1866 1046
1867 1052
1868 1058
1869 1063
1870 1069
1871 1075
1872 1081
1873 1086
1874 1092
1875 1098
1876 1104
1877 1110
1878 1116
1879 1122
1880 1128
1881 1134
1882 1140
1883 1146
1884 1152
1885 1159
1886 1113
1887 1300
1888 1249
1889 1161
1890 1155
1891 1057
1892 1156
1893 1309
1894 1486
1895 1374
1896 1512
1897 1485
1898 1524
1899 1615
1900 1579
1901 1617
1902 1755
1903 1633
1904 1804
1905 1595
1906 1523
1907 1462
1908 1595
1909 1655
1910 1764
1911 1628
1912 1758
1913 1845
1914 1760
1915 1810
1916 1607
1917 1410
1918 862.3
1919 742.7
1920 745
1921 681.3
1922 790.1
1923 909.2
1924 1151
1925 1437
1926 1612
1927 1677
1928 1762
1929 1781
1930 1860
1931 1875
1932 1844
1933 1912
1934 2085
1935 2382
1936 2541
1937 2750
1938 2739
1939 2848
1940 2727
1941 2673
1942 2620
1943 2569
1944 2518
1945 2469
1946 2420
1947 2686
1948 3032
1949 3308
1950 3580
1951 3532
1952 3693
1953 3785
1954 3899
1955 4155
1956 4468
1957 4476
1958 4724
1959 4584
1960 4925
1961 5115
1962 5168
1963 4974
1964 5541
1965 5784
1966 5996
1967 6195
1968 6493
1969 6522
1970 6959
1971 7074
1972 7044
1973 7563
1974 7671
1975 7582
1976 7826
1977 7899
1978 7987
1979 7843
1980 7750
1981 7718
1982 7804
1983 7945
1984 7931
1985 7892
1986 8103
1987 8098
1988 8163
1989 8202
1990 7912
1991 7740
1992 5906
1993 4491
1994 3570
1995 3125
1996 3150
1997 3321
1998 3644
1999 3906
2000 4329
2001 4744
2002 5228
2003 5790
2004 6426
2005 7944
2006 10550
2007 13020
2008 14240
2009 15360
2010 15940
2011 15750
2012 15880
2013 16670
2014 17350
2015 18010
2016 18490
2017 18930
2018 19530
2019 20200