Year Measure
1820 555.2
1821 557.8
1822 560.4
1823 563.1
1824 565.7
1825 568.4
1826 571
1827 573.7
1828 576.4
1829 579.1
1830 581.8
1831 584.5
1832 587.3
1833 590
1834 592.8
1835 595.6
1836 598.4
1837 601.2
1838 604
1839 606.8
1840 609.7
1841 612.5
1842 615.4
1843 618.3
1844 621.2
1845 624.1
1846 627
1847 630
1848 632.9
1849 635.9
1850 638.9
1851 641.9
1852 644.9
1853 647.9
1854 650.9
1855 654
1856 657
1857 660.1
1858 663.2
1859 666.3
1860 669.5
1861 672.6
1862 675.8
1863 678.9
1864 682.1
1865 685.3
1866 688.5
1867 691.7
1868 695
1869 698.2
1870 701.5
1871 704.8
1872 708.1
1873 711.4
1874 714.8
1875 718.1
1876 721.5
1877 724.9
1878 728.3
1879 731.7
1880 735.1
1881 738.6
1882 742
1883 745.5
1884 749
1885 752.5
1886 756
1887 759.6
1888 763.2
1889 766.7
1890 770.3
1891 773.9
1892 777.6
1893 781.2
1894 784.9
1895 788.6
1896 792.3
1897 796
1898 799.7
1899 803.5
1900 807.2
1901 811
1902 814.8
1903 818.6
1904 822.5
1905 826.3
1906 830.2
1907 834.1
1908 838
1909 841.9
1910 845.9
1911 849.8
1912 853.8
1913 857.8
1914 862.4
1915 866.9
1916 871.5
1917 876.1
1918 880.7
1919 885.4
1920 890.1
1921 894.8
1922 899.5
1923 904.2
1924 909
1925 913.8
1926 918.6
1927 923.5
1928 928.4
1929 933.3
1930 938.2
1931 943.2
1932 948.1
1933 953.1
1934 958.2
1935 963.2
1936 968.3
1937 973.4
1938 978.6
1939 983.8
1940 989
1941 994.2
1942 999.4
1943 1005
1944 1010
1945 1015
1946 1021
1947 1026
1948 1032
1949 1037
1950 1042
1951 1072
1952 1102
1953 1132
1954 1162
1955 1193
1956 1224
1957 1255
1958 1285
1959 1317
1960 1403
1961 1622
1962 1566
1963 1450
1964 1858
1965 2086
1966 2067
1967 2108
1968 2260
1969 2190
1970 2379
1971 2363
1972 2353
1973 2170
1974 2351
1975 2162
1976 2292
1977 2221
1978 2169
1979 2222
1980 2262
1981 2295
1982 2197
1983 2249
1984 2035
1985 2041
1986 2100
1987 2108
1988 2128
1989 2148
1990 2067
1991 2061
1992 2019
1993 2047
1994 2072
1995 2109
1996 2181
1997 2199
1998 2217
1999 2241
2000 2285
2001 2316
2002 2342
2003 2402
2004 2454
2005 2508
2006 2722
2007 2679
2008 2703
2009 2605
2010 2672
2011 2710
2012 2831
2013 2949
2014 3077
2015 3201
2016 3324
2017 3525
2018 3632
2019 3926