Year Measure
1820 469.5
1821 471.7
1822 473.9
1823 476.2
1824 478.4
1825 480.6
1826 482.9
1827 485.1
1828 487.4
1829 489.7
1830 492
1831 494.3
1832 496.6
1833 499
1834 501.3
1835 503.6
1836 506
1837 508.4
1838 510.8
1839 513.2
1840 515.6
1841 518
1842 520.4
1843 522.9
1844 525.3
1845 527.8
1846 530.2
1847 532.7
1848 535.2
1849 537.7
1850 540.3
1851 542.8
1852 545.3
1853 547.9
1854 550.5
1855 553
1856 555.6
1857 558.2
1858 560.9
1859 563.5
1860 566.1
1861 568.8
1862 571.5
1863 574.1
1864 576.8
1865 579.5
1866 582.2
1867 585
1868 587.7
1869 590.5
1870 593.2
1871 596
1872 598.8
1873 601.6
1874 604.5
1875 607.3
1876 610.1
1877 613
1878 615.9
1879 618.8
1880 621.7
1881 624.6
1882 627.5
1883 630.4
1884 633.4
1885 636.4
1886 639.4
1887 642.4
1888 645.4
1889 648.4
1890 651.4
1891 654.5
1892 657.6
1893 660.6
1894 663.7
1895 666.8
1896 670
1897 673.1
1898 676.3
1899 679.4
1900 682.6
1901 685.8
1902 689
1903 692.3
1904 695.5
1905 698.8
1906 702.1
1907 705.4
1908 708.7
1909 712
1910 715.3
1911 718.7
1912 722
1913 725.4
1914 730.2
1915 735.1
1916 739.9
1917 744.8
1918 749.8
1919 754.7
1920 759.7
1921 764.7
1922 769.8
1923 774.9
1924 780
1925 785.2
1926 790.4
1927 795.6
1928 800.9
1929 806.2
1930 811.5
1931 816.9
1932 822.3
1933 827.7
1934 833.2
1935 838.7
1936 844.3
1937 849.9
1938 855.5
1939 861.2
1940 866.9
1941 872.6
1942 878.4
1943 884.2
1944 890
1945 895.9
1946 901.9
1947 907.8
1948 913.8
1949 919.9
1950 926
1951 944.9
1952 963.5
1953 981.7
1954 1000
1955 1019
1956 1038
1957 1057
1958 1075
1959 1094
1960 1142
1961 1165
1962 1262
1963 1358
1964 1333
1965 1403
1966 1356
1967 1333
1968 1315
1969 1249
1970 1259
1971 1301
1972 1207
1973 979.1
1974 1041
1975 988.8
1976 972.4
1977 1023
1978 1133
1979 1184
1980 1211
1981 1195
1982 1150
1983 1101
1984 891.1
1985 883.4
1986 900
1987 845.2
1988 869.3
1989 847.6
1990 810.1
1991 808.1
1992 735
1993 724.7
1994 732.6
1995 730.3
1996 733.9
1997 733.9
1998 788.3
1999 761.8
2000 729.9
2001 759.6
2002 760.1
2003 771.6
2004 743.4
2005 775.2
2006 792
2007 769.2
2008 814.2
2009 779
2010 836.2
2011 828.5
2012 892.4
2013 896.3
2014 926.1
2015 951.5
2016 1054
2017 1145
2018 1219
2019 1281