Year Measure
1820 523.3
1821 525.7
1822 528.2
1823 530.7
1824 533.2
1825 535.7
1826 538.2
1827 540.7
1828 543.2
1829 545.8
1830 548.3
1831 550.9
1832 553.5
1833 556.1
1834 558.7
1835 561.3
1836 563.9
1837 566.6
1838 569.2
1839 571.9
1840 574.6
1841 577.3
1842 580
1843 582.7
1844 585.4
1845 588.2
1846 590.9
1847 593.7
1848 596.5
1849 599.3
1850 602.1
1851 604.9
1852 607.8
1853 610.6
1854 613.5
1855 616.4
1856 619.2
1857 622.2
1858 625.1
1859 628
1860 630.9
1861 633.9
1862 636.9
1863 639.9
1864 642.9
1865 645.9
1866 648.9
1867 651.9
1868 655
1869 658.1
1870 661.2
1871 664.3
1872 667.4
1873 670.5
1874 673.7
1875 676.8
1876 680
1877 683.2
1878 686.4
1879 689.6
1880 692.8
1881 696.1
1882 699.3
1883 702.6
1884 705.9
1885 709.2
1886 712.5
1887 715.9
1888 719.2
1889 722.6
1890 726
1891 729.4
1892 732.8
1893 736.3
1894 739.7
1895 743.2
1896 746.7
1897 750.2
1898 753.7
1899 757.2
1900 760.8
1901 764.3
1902 767.9
1903 771.5
1904 775.1
1905 778.8
1906 782.4
1907 786.1
1908 789.8
1909 793.5
1910 797.2
1911 801
1912 804.7
1913 808.5
1914 825.4
1915 842.7
1916 860.4
1917 878.5
1918 896.9
1919 915.7
1920 934.9
1921 954.5
1922 974.5
1923 995
1924 1016
1925 1037
1926 1059
1927 1081
1928 1104
1929 1127
1930 1151
1931 1175
1932 1199
1933 1224
1934 1250
1935 1276
1936 1303
1937 1330
1938 1358
1939 1387
1940 1416
1941 1446
1942 1476
1943 1507
1944 1538
1945 1571
1946 1604
1947 1637
1948 1672
1949 1707
1950 1742
1951 1774
1952 1804
1953 1833
1954 1863
1955 1893
1956 1921
1957 1950
1958 1978
1959 2004
1960 2000
1961 2041
1962 2058
1963 2086
1964 2075
1965 2091
1966 2087
1967 2005
1968 2075
1969 1885
1970 1986
1971 1924
1972 1987
1973 1820
1974 1840
1975 1932
1976 2059
1977 1942
1978 1809
1979 1876
1980 1759
1981 1692
1982 1889
1983 1877
1984 1736
1985 1747
1986 1776
1987 1793
1988 1829
1989 1744
1990 1770
1991 1712
1992 1701
1993 1619
1994 1620
1995 1658
1996 1695
1997 1732
1998 1782
1999 1824
2000 1880
2001 1918
2002 1890
2003 1965
2004 2028
2005 2084
2006 2078
2007 2124
2008 2143
2009 2132
2010 2165
2011 2163
2012 2174
2013 2198
2014 2233
2015 2273
2016 2322
2017 2371
2018 2422
2019 2474