Year Measure
1800 453.7
1801 454.2
1802 454.7
1803 455.3
1804 455.8
1805 456.3
1806 456.8
1807 457.3
1808 457.8
1809 458.3
1810 458.8
1811 459.3
1812 459.9
1813 460.4
1814 460.9
1815 461.4
1816 461.9
1817 462.4
1818 463
1819 463.5
1820 464
1821 464.5
1822 465
1823 465.5
1824 466.1
1825 466.6
1826 467.1
1827 467.6
1828 468.2
1829 468.7
1830 469.2
1831 469.7
1832 470.3
1833 470.8
1834 471.3
1835 471.8
1836 472.4
1837 472.9
1838 473.4
1839 474
1840 474.5
1841 475
1842 475.5
1843 476.1
1844 476.6
1845 477.1
1846 477.7
1847 478.2
1848 478.7
1849 479.3
1850 479.8
1851 480.4
1852 480.9
1853 481.4
1854 482
1855 482.5
1856 483
1857 483.6
1858 484.1
1859 484.7
1860 485.2
1861 485.8
1862 486.3
1863 486.8
1864 487.4
1865 487.9
1866 488.5
1867 489
1868 489.6
1869 490.1
1870 490.7
1871 491.2
1872 491.8
1873 492.3
1874 492.9
1875 493.4
1876 494
1877 494.5
1878 495.1
1879 495.6
1880 496.2
1881 496.7
1882 497.3
1883 497.9
1884 498.4
1885 499
1886 499.5
1887 500.1
1888 500.6
1889 501.2
1890 501.8
1891 502.3
1892 502.9
1893 503.5
1894 504
1895 504.6
1896 505.1
1897 505.7
1898 506.3
1899 506.8
1900 507.4
1901 508
1902 508.5
1903 509.1
1904 509.7
1905 510.3
1906 510.8
1907 511.4
1908 512
1909 512.5
1910 513.1
1911 513.7
1912 514.3
1913 514.8
1914 515.4
1915 516
1916 516.6
1917 517.1
1918 517.7
1919 518.3
1920 518.9
1921 519.5
1922 520
1923 520.6
1924 521.2
1925 521.8
1926 522.4
1927 523
1928 523.5
1929 524.1
1930 524.7
1931 525.3
1932 525.9
1933 526.5
1934 527.1
1935 527.7
1936 528.3
1937 528.8
1938 529.4
1939 530
1940 530.6
1941 531.2
1942 531.8
1943 532.4
1944 533
1945 533.6
1946 534.2
1947 534.8
1948 535.4
1949 536
1950 536.6
1951 556.6
1952 562.8
1953 572.9
1954 592.8
1955 598.6
1956 607.8
1957 616.4
1958 619.4
1959 639.7
1960 643.7
1961 613.3
1962 681.7
1963 599.5
1964 515.5
1965 538.1
1966 559.7
1967 583
1968 606.5
1969 653.3
1970 703.2
1971 691.2
1972 673.8
1973 674.6
1974 686.9
1975 790.5
1976 751.8
1977 764.5
1978 811.4
1979 859.7
1980 934.1
1981 962.6
1982 1006
1983 1030
1984 959.3
1985 976.6
1986 1004
1987 967.5
1988 905.4
1989 897.2
1990 868
1991 808.8
1992 840.9
1993 753.9
1994 436.3
1995 663.3
1996 710.7
1997 673.1
1998 734.5
1999 773
2000 803.3
2001 838.6
2002 896.4
2003 883.2
2004 896.5
2005 927.6
2006 995.2
2007 1029
2008 1142
2009 1189
2010 1248
2011 1324
2012 1400
2013 1439
2014 1515
2015 1596
2016 1680
2017 1769
2018 1862
2019 1961