Year Measure
1800 510
1801 512
1802 514.1
1803 516.1
1804 518.2
1805 520.3
1806 522.3
1807 524.4
1808 526.5
1809 528.6
1810 530.7
1811 532.8
1812 535
1813 537.1
1814 539.3
1815 541.4
1816 543.6
1817 545.7
1818 547.9
1819 550.1
1820 552.3
1821 554.5
1822 556.7
1823 558.9
1824 561.2
1825 563.4
1826 565.7
1827 567.9
1828 570.2
1829 572.5
1830 574.7
1831 577
1832 579.3
1833 581.7
1834 584
1835 586.3
1836 588.7
1837 591
1838 593.4
1839 595.7
1840 598.1
1841 600.5
1842 602.9
1843 605.3
1844 607.7
1845 610.1
1846 612.6
1847 615
1848 617.5
1849 619.9
1850 622.4
1851 624.9
1852 627.4
1853 629.9
1854 632.4
1855 634.9
1856 637.5
1857 640
1858 642.6
1859 645.1
1860 647.7
1861 650.3
1862 652.9
1863 655.5
1864 658.1
1865 660.8
1866 663.4
1867 666
1868 668.7
1869 671.4
1870 674
1871 676.7
1872 679.4
1873 682.1
1874 684.9
1875 687.6
1876 690.4
1877 693.1
1878 695.9
1879 698.7
1880 701.4
1881 704.2
1882 707.1
1883 709.9
1884 712.7
1885 715.6
1886 718.4
1887 721.3
1888 724.2
1889 727
1890 730
1891 732.9
1892 735.8
1893 738.7
1894 741.7
1895 744.6
1896 747.6
1897 750.6
1898 753.6
1899 756.6
1900 759.6
1901 762.7
1902 765.7
1903 768.8
1904 771.8
1905 774.9
1906 778
1907 781.1
1908 784.2
1909 787.4
1910 790.5
1911 793.7
1912 796.8
1913 800
1914 815.5
1915 831.4
1916 847.6
1917 864
1918 880.8
1919 897.9
1920 915.4
1921 933.2
1922 951.3
1923 969.8
1924 988.6
1925 1008
1926 1027
1927 1047
1928 1068
1929 1089
1930 1110
1931 1131
1932 1153
1933 1176
1934 1198
1935 1222
1936 1246
1937 1270
1938 1294
1939 1320
1940 1345
1941 1371
1942 1398
1943 1425
1944 1453
1945 1481
1946 1510
1947 1539
1948 1569
1949 1600
1950 1631
1951 1834
1952 1928
1953 2084
1954 2134
1955 2226
1956 2303
1957 2279
1958 2183
1959 2183
1960 2331
1961 2042
1962 2263
1963 2253
1964 2212
1965 2118
1966 2191
1967 2101
1968 2168
1969 2272
1970 2204
1971 2310
1972 2260
1973 2375
1974 2450
1975 2144
1976 1943
1977 1872
1978 1720
1979 1665
1980 1657
1981 1658
1982 1606
1983 1584
1984 1627
1985 1589
1986 1616
1987 1610
1988 1570
1989 1498
1990 1350
1991 1201
1992 1032
1993 857
1994 793.5
1995 773.4
1996 744.1
1997 687.6
1998 661.3
1999 619.2
2000 562.6
2001 536.1
2002 538.8
2003 553.1
2004 572.3
2005 599
2006 614.6
2007 635
2008 655.7
2009 655.7
2010 684
2011 712
2012 740.8
2013 780.2
2014 823.2
2015 867.5
2016 909.1
2017 946.7
2018 978.8
2019 1003