Year Measure
1800 374.3
1801 374.7
1802 375.2
1803 375.6
1804 376
1805 376.5
1806 376.9
1807 377.4
1808 377.8
1809 378.3
1810 378.7
1811 379.2
1812 379.6
1813 380
1814 380.5
1815 380.9
1816 381.4
1817 381.8
1818 382.3
1819 382.7
1820 383.2
1821 383.6
1822 384.1
1823 384.6
1824 385
1825 385.5
1826 385.9
1827 386.4
1828 386.8
1829 387.3
1830 387.7
1831 388.2
1832 388.6
1833 389.1
1834 389.6
1835 390
1836 390.5
1837 390.9
1838 391.4
1839 391.9
1840 392.3
1841 392.8
1842 393.3
1843 393.7
1844 394.2
1845 394.6
1846 395.1
1847 395.6
1848 396
1849 396.5
1850 397
1851 397.4
1852 397.9
1853 398.4
1854 398.9
1855 399.3
1856 399.8
1857 400.3
1858 400.7
1859 401.2
1860 401.7
1861 402.2
1862 402.6
1863 403.1
1864 403.6
1865 404.1
1866 404.5
1867 405
1868 405.5
1869 406
1870 406.4
1871 406.9
1872 407.4
1873 407.9
1874 408.4
1875 408.8
1876 409.3
1877 409.8
1878 410.3
1879 410.8
1880 411.3
1881 411.7
1882 412.2
1883 412.7
1884 413.2
1885 413.7
1886 414.2
1887 414.7
1888 415.1
1889 415.6
1890 416.1
1891 416.6
1892 417.1
1893 417.6
1894 418.1
1895 418.6
1896 419.1
1897 419.6
1898 420.1
1899 420.6
1900 421.1
1901 422.5
1902 423.9
1903 425.3
1904 426.7
1905 428.2
1906 429.6
1907 431.1
1908 432.5
1909 434
1910 435.4
1911 436.9
1912 438.3
1913 439.8
1914 441.3
1915 442.8
1916 444.3
1917 445.7
1918 447.2
1919 448.7
1920 450.2
1921 451.8
1922 453.3
1923 454.8
1924 456.3
1925 457.9
1926 459.4
1927 460.9
1928 462.5
1929 464
1930 465.6
1931 467.2
1932 468.7
1933 470.3
1934 471.9
1935 473.5
1936 475
1937 476.6
1938 478.2
1939 479.8
1940 481.5
1941 483.1
1942 484.7
1943 486.3
1944 488
1945 489.6
1946 491.2
1947 492.9
1948 494.5
1949 496.2
1950 497.9
1951 517.1
1952 527.2
1953 541.1
1954 562.8
1955 571.6
1956 587.1
1957 598
1958 608.4
1959 633.7
1960 688.4
1961 743.8
1962 817.9
1963 928.2
1964 1056
1965 1186
1966 1220
1967 1285
1968 1313
1969 1258
1970 1207
1971 1094
1972 943.6
1973 982.6
1974 1041
1975 1194
1976 1339
1977 1345
1978 1450
1979 1421
1980 1362
1981 1313
1982 1302
1983 1259
1984 1179
1985 1250
1986 1164
1987 1170
1988 1164
1989 1116
1990 1057
1991 1012
1992 1318
1993 1414
1994 1595
1995 1813
1996 2922
1997 7069
1998 8471
1999 10310
2000 11810
2001 18680
2002 21620
2003 23880
2004 31970
2005 34060
2006 33490
2007 36820
2008 40180
2009 35910
2010 34460
2011 35180
2012 35310
2013 32670
2014 31010
2015 27690
2016 27210
2017 25040
2018 22520
2019 19890