Year Measure
1800 514.1
1820 518.7
1850 539.9
1870 554.8
1871 547.3
1872 540.3
1873 545.4
1874 552
1875 556.5
1876 567.8
1877 568.9
1878 556.4
1879 562.8
1880 561
1881 589.1
1882 567.3
1883 554.7
1884 595
1885 594.5
1886 585
1887 585.6
1888 580.5
1889 575
1890 554.2
1891 563.9
1892 580.1
1893 591.6
1894 593.5
1895 588.5
1896 586
1897 586.2
1898 582
1899 604.2
1900 615.9
1901 600.8
1902 583.1
1903 608.3
1904 609.5
1905 610.2
1906 619.6
1907 627.9
1908 621.2
1909 643.4
1910 673.9
1911 697.4
1912 700.8
1913 723.9
1914 715.9
1915 717.2
1916 715.3
1917 709.2
1918 722.5
1919 779.1
1920 748.5
1921 741.6
1922 753
1923 758.9
1924 788
1925 793.8
1926 829.9
1927 870.9
1928 891.6
1929 903.9
1930 904.3
1931 823.3
1932 808.2
1933 801.5
1934 804.9
1935 830.8
1936 881.1
1937 936.2
1938 949.7
1939 949.5
1940 1018
1941 1013
1942 743.6
1943 659.2
1944 525.2
1945 462.6
1946 477.2
1947 527
1948 611.5
1949 666.1
1950 704.4
1951 744.3
1952 749.7
1953 770.9
1954 807.6
1955 823.7
1956 804.8
1957 858.9
1958 792.5
1959 816.6
1960 835
1961 859.8
1962 849.3
1963 798.2
1964 809.6
1965 802.6
1966 794.1
1967 762.4
1968 827.3
1969 911.1
1970 986.7
1971 1023
1972 1111
1973 1245
1974 1262
1975 1229
1976 1315
1977 1383
1978 1418
1979 1456
1980 1549
1981 1608
1982 1517
1983 1533
1984 1609
1985 1620
1986 1690
1987 1748
1988 1822
1989 1956
1990 2098
1991 2177
1992 2383
1993 2519
1994 2674
1995 2852
1996 3027
1997 3119
1998 2656
1999 2627
2000 2715
2001 2788
2002 2874
2003 2984
2004 3096
2005 3234
2006 3364
2007 3527
2008 3687
2009 3803
2010 3983
2011 4182
2012 4380
2013 4590
2014 4815
2015 5053
2016 5306
2017 5572
2018 5850