Year Measure
1820 545.5
1821 548.1
1822 550.7
1823 553.2
1824 555.8
1825 558.5
1826 561.1
1827 563.7
1828 566.3
1829 569
1830 571.7
1831 574.3
1832 577
1833 579.7
1834 582.5
1835 585.2
1836 587.9
1837 590.7
1838 593.5
1839 596.2
1840 599
1841 601.9
1842 604.7
1843 607.5
1844 610.4
1845 613.2
1846 616.1
1847 619
1848 621.9
1849 624.8
1850 627.7
1851 630.7
1852 633.6
1853 636.6
1854 639.6
1855 642.6
1856 645.6
1857 648.6
1858 651.7
1859 654.7
1860 657.8
1861 660.9
1862 664
1863 667.1
1864 670.2
1865 673.4
1866 676.5
1867 679.7
1868 682.9
1869 686.1
1870 689.3
1871 692.5
1872 695.8
1873 699
1874 702.3
1875 705.6
1876 708.9
1877 712.2
1878 715.6
1879 718.9
1880 722.3
1881 725.7
1882 729.1
1883 732.5
1884 736
1885 739.4
1886 742.9
1887 746.4
1888 749.9
1889 753.4
1890 756.9
1891 760.5
1892 764
1893 767.6
1894 771.2
1895 774.8
1896 778.5
1897 782.1
1898 785.8
1899 789.5
1900 793.2
1901 796.9
1902 800.6
1903 804.4
1904 808.1
1905 811.9
1906 815.7
1907 819.6
1908 823.4
1909 827.3
1910 831.1
1911 835
1912 839
1913 842.9
1914 859.7
1915 876.7
1916 894.2
1917 912
1918 930.1
1919 948.6
1920 967.5
1921 986.7
1922 1006
1923 1026
1924 1047
1925 1068
1926 1089
1927 1110
1928 1133
1929 1155
1930 1178
1931 1201
1932 1225
1933 1250
1934 1275
1935 1300
1936 1326
1937 1352
1938 1379
1939 1406
1940 1434
1941 1463
1942 1492
1943 1522
1944 1552
1945 1583
1946 1614
1947 1646
1948 1679
1949 1712
1950 1746
1951 1781
1952 1819
1953 1853
1954 1891
1955 1929
1956 2076
1957 1992
1958 2018
1959 2197
1960 2178
1961 2119
1962 2205
1963 2085
1964 2009
1965 2094
1966 2014
1967 1900
1968 1963
1969 2029
1970 1890
1971 1964
1972 1868
1973 1659
1974 1772
1975 1936
1976 2222
1977 2479
1978 2357
1979 2035
1980 1982
1981 1958
1982 2133
1983 2039
1984 1869
1985 1683
1986 1698
1987 1697
1988 1682
1989 1772
1990 1582
1991 1642
1992 1679
1993 1683
1994 1670
1995 1675
1996 1715
1997 1837
1998 1891
1999 1979
2000 2109
2001 2176
2002 2243
2003 2338
2004 2393
2005 2531
2006 2687
2007 2841
2008 2853
2009 2925
2010 2923
2011 3524
2012 3332
2013 3356
2014 3359
2015 3425
2016 3540
2017 3630
2018 3731
2019 3794