Year Measure
1820 602.9
1821 605.7
1822 608.6
1823 611.4
1824 614.3
1825 617.2
1826 620.1
1827 623
1828 625.9
1829 628.8
1830 631.8
1831 634.7
1832 637.7
1833 640.7
1834 643.7
1835 646.7
1836 649.8
1837 652.8
1838 655.9
1839 658.9
1840 662
1841 665.1
1842 668.3
1843 671.4
1844 674.5
1845 677.7
1846 680.9
1847 684.1
1848 687.3
1849 690.5
1850 693.7
1851 697
1852 700.3
1853 703.5
1854 706.8
1855 710.2
1856 713.5
1857 716.8
1858 720.2
1859 723.6
1860 727
1861 730.4
1862 733.8
1863 737.2
1864 740.7
1865 744.2
1866 747.7
1867 751.2
1868 754.7
1869 758.2
1870 761.8
1871 765.4
1872 768.9
1873 772.5
1874 776.2
1875 779.8
1876 783.5
1877 787.1
1878 790.8
1879 794.5
1880 798.3
1881 802
1882 805.8
1883 809.5
1884 813.3
1885 817.2
1886 821
1887 824.8
1888 828.7
1889 832.6
1890 836.5
1891 840.4
1892 844.4
1893 848.3
1894 852.3
1895 856.3
1896 860.3
1897 864.3
1898 868.4
1899 872.5
1900 876.6
1901 880.7
1902 884.8
1903 888.9
1904 893.1
1905 897.3
1906 901.5
1907 905.7
1908 910
1909 914.2
1910 918.5
1911 922.8
1912 927.2
1913 931.5
1914 949.9
1915 968.7
1916 987.8
1917 1007
1918 1027
1919 1048
1920 1068
1921 1089
1922 1111
1923 1133
1924 1155
1925 1178
1926 1201
1927 1225
1928 1249
1929 1274
1930 1299
1931 1325
1932 1351
1933 1378
1934 1405
1935 1433
1936 1461
1937 1490
1938 1519
1939 1549
1940 1580
1941 1611
1942 1643
1943 1676
1944 1709
1945 1742
1946 1777
1947 1812
1948 1848
1949 1884
1950 1922
1951 1963
1952 2004
1953 2044
1954 2085
1955 2126
1956 2166
1957 2207
1958 2248
1959 2287
1960 2274
1961 2276
1962 2282
1963 2215
1964 2256
1965 2198
1966 2197
1967 2269
1968 2372
1969 2408
1970 2478
1971 2517
1972 2428
1973 2311
1974 2302
1975 2276
1976 2149
1977 2144
1978 2035
1979 2175
1980 2132
1981 1895
1982 1809
1983 1773
1984 1661
1985 1651
1986 1616
1987 1605
1988 1584
1989 1601
1990 1615
1991 1470
1992 1445
1993 1433
1994 1391
1995 1374
1996 1361
1997 1370
1998 1381
1999 1403
2000 1426
2001 1467
2002 1242
2003 1324
2004 1352
2005 1372
2006 1402
2007 1450
2008 1512
2009 1412
2010 1382
2011 1372
2012 1371
2013 1369
2014 1377
2015 1398
2016 1427
2017 1465
2018 1505
2019 1547