Year Measure
1800 528.7
1801 528.7
1802 528.7
1803 528.7
1804 528.7
1805 528.7
1806 528.7
1807 528.7
1808 528.7
1809 528.7
1810 528.7
1811 528.7
1812 528.7
1813 528.7
1814 528.7
1815 528.7
1816 528.7
1817 528.7
1818 528.7
1819 528.7
1820 528.7
1821 530.2
1822 531.8
1823 533.4
1824 534.9
1825 536.5
1826 538
1827 539.6
1828 541.2
1829 542.8
1830 544.4
1831 546
1832 547.6
1833 549.2
1834 550.8
1835 552.4
1836 554
1837 555.6
1838 557.2
1839 558.9
1840 560.5
1841 562.1
1842 563.8
1843 565.4
1844 567.1
1845 568.8
1846 570.4
1847 572.1
1848 573.8
1849 575.4
1850 577.1
1851 578.8
1852 580.5
1853 582.2
1854 583.9
1855 585.6
1856 587.3
1857 589
1858 590.8
1859 592.5
1860 594.2
1861 596
1862 597.7
1863 599.5
1864 601.2
1865 603
1866 604.7
1867 606.5
1868 608.3
1869 610.1
1870 611.8
1871 613.6
1872 615.4
1873 617.2
1874 619
1875 620.8
1876 622.7
1877 624.5
1878 626.3
1879 628.1
1880 630
1881 631.8
1882 633.7
1883 635.5
1884 637.4
1885 639.2
1886 612.8
1887 714.5
1888 685.4
1889 635.5
1890 631.1
1891 576.4
1892 629.3
1893 711.1
1894 806.2
1895 743.9
1896 817
1897 801.1
1898 820
1899 867.7
1900 846.7
1901 865.3
1902 937.6
1903 870.5
1904 959.9
1905 847.2
1906 807.4
1907 773.7
1908 842.5
1909 872.2
1910 928.1
1911 855
1912 921.2
1913 965
1914 918.9
1915 943
1916 936.6
1917 809.3
1918 699.3
1919 604.2
1920 569.2
1921 536.3
1922 577.1
1923 621
1924 668.2
1925 719
1926 773.8
1927 832.6
1928 896
1929 903.8
1930 941.9
1931 947.8
1932 930.5
1933 962.8
1934 1048
1935 1195
1936 1273
1937 1374
1938 1367
1939 1418
1940 1355
1941 1326
1942 1297
1943 1269
1944 1242
1945 1215
1946 1189
1947 1317
1948 1484
1949 1616
1950 1746
1951 1719
1952 1794
1953 1835
1954 1887
1955 2007
1956 2154
1957 2154
1958 2269
1959 2198
1960 2356
1961 2447
1962 2473
1963 2380
1964 2651
1965 2767
1966 2869
1967 2964
1968 3107
1969 3121
1970 3330
1971 3385
1972 3370
1973 3619
1974 3621
1975 3531
1976 3596
1977 3581
1978 3573
1979 3461
1980 3375
1981 3316
1982 3308
1983 3322
1984 3272
1985 3213
1986 3255
1987 3209
1988 3191
1989 3164
1990 3011
1991 2923
1992 2542
1993 2434
1994 2265
1995 2207
1996 2208
1997 2286
1998 2349
1999 2413
2000 2470
2001 2540
2002 2605
2003 2675
2004 2835
2005 2983
2006 3165
2007 3414
2008 3669
2009 3903
2010 4160
2011 4412
2012 4671
2013 4962
2014 5246
2015 5521
2016 5783
2017 6028
2018 6285
2019 6552