Year Measure
1820 742.4
1821 743.9
1822 745.3
1823 746.8
1824 748.3
1825 749.8
1826 751.2
1827 752.7
1828 754.2
1829 755.7
1830 757.2
1831 758.7
1832 760.2
1833 761.7
1834 763.2
1835 764.7
1836 766.2
1837 767.7
1838 769.3
1839 770.8
1840 772.3
1841 773.8
1842 775.3
1843 776.9
1844 778.4
1845 780
1846 781.5
1847 783
1848 784.6
1849 786.1
1850 787.7
1851 842
1852 819.3
1853 768.9
1854 742.6
1855 749.7
1856 776.9
1857 831.4
1858 884.9
1859 877.8
1860 901
1861 893
1862 850.6
1863 869.8
1864 881.9
1865 947.4
1866 981.7
1867 1063
1868 1063
1869 1063
1870 985.8
1871 985.8
1872 1020
1873 989.8
1874 1005
1875 1020
1876 981.7
1877 954.5
1878 1001
1879 1009
1880 962.6
1881 970.6
1882 993.9
1883 966.6
1884 1032
1885 958.5
1886 989.8
1887 924.2
1888 888.9
1889 901
1890 985.8
1891 1047
1892 908.1
1893 772.9
1894 772.9
1895 916.2
1896 831.4
1897 819.3
1898 838.5
1899 823.3
1900 792.1
1901 893.2
1902 867.3
1903 869
1904 857.5
1905 871.3
1906 959.9
1907 952.1
1908 901.7
1909 971.7
1910 979.8
1911 1016
1912 1061
1913 1072
1914 1033
1915 1017
1916 1005
1917 1079
1918 1032
1919 1092
1920 1206
1921 1204
1922 1275
1923 1355
1924 1350
1925 1322
1926 1362
1927 1482
1928 1622
1929 1604
1930 1540
1931 1455
1932 1489
1933 1594
1934 1704
1935 1722
1936 1893
1937 1942
1938 1989
1939 1997
1940 1937
1941 1989
1942 1887
1943 2007
1944 2120
1945 2140
1946 2335
1947 2333
1948 2498
1949 2622
1950 2727
1951 2782
1952 2905
1953 2955
1954 3098
1955 3277
1956 3273
1957 3426
1958 3692
1959 3942
1960 4193
1961 4427
1962 4596
1963 4490
1964 4513
1965 4491
1966 4663
1967 4724
1968 5051
1969 5385
1970 5763
1971 6273
1972 6867
1973 7656
1974 8090
1975 8307
1976 8953
1977 9173
1978 9401
1979 9804
1980 10500
1981 9819
1982 9684
1983 9190
1984 9490
1985 10040
1986 10580
1987 10750
1988 10550
1989 10690
1990 9830
1991 9776
1992 9573
1993 9900
1994 10330
1995 10620
1996 10760
1997 10960
1998 10830
1999 10770
2000 11100
2001 11050
2002 11200
2003 11170
2004 11650
2005 11840
2006 12180
2007 12800
2008 13330
2009 13170
2010 14040
2011 14300
2012 14330
2013 14530
2014 14670
2015 14930
2016 15260
2017 15620
2018 16020
2019 16470