Year Measure
1800 580
1801 580.4
1802 580.8
1803 581.3
1804 581.7
1805 582.1
1806 582.6
1807 583
1808 583.4
1809 583.8
1810 584.3
1811 584.7
1812 585.1
1813 585.5
1814 586
1815 586.4
1816 586.8
1817 587.3
1818 587.7
1819 588.1
1820 588.6
1821 589
1822 589.4
1823 589.8
1824 590.3
1825 590.7
1826 591.1
1827 591.6
1828 592
1829 592.4
1830 592.9
1831 593.3
1832 593.7
1833 594.2
1834 594.6
1835 595
1836 595.5
1837 595.9
1838 596.4
1839 596.8
1840 597.2
1841 597.7
1842 598.1
1843 598.5
1844 599
1845 599.4
1846 599.9
1847 600.3
1848 600.7
1849 601.2
1850 601.6
1851 602.1
1852 602.5
1853 602.9
1854 603.4
1855 603.8
1856 604.3
1857 604.7
1858 605.1
1859 605.6
1860 606
1861 606.5
1862 606.9
1863 607.4
1864 607.8
1865 608.3
1866 608.7
1867 609.1
1868 609.6
1869 610
1870 610.5
1871 610.9
1872 611.4
1873 611.8
1874 612.3
1875 612.7
1876 613.2
1877 613.6
1878 614.1
1879 614.5
1880 615
1881 615.4
1882 615.9
1883 616.3
1884 616.8
1885 617.2
1886 617.7
1887 618.1
1888 618.6
1889 619
1890 619.5
1891 619.9
1892 620.4
1893 620.8
1894 621.3
1895 621.8
1896 622.2
1897 622.7
1898 623.1
1899 623.6
1900 624
1901 624.5
1902 624.9
1903 625.4
1904 625.9
1905 626.3
1906 626.8
1907 627.2
1908 627.7
1909 628.2
1910 628.6
1911 629.1
1912 629.5
1913 630
1914 648.1
1915 666.7
1916 685.8
1917 705.5
1918 725.7
1919 746.5
1920 767.9
1921 790
1922 812.6
1923 836
1924 859.9
1925 884.6
1926 910
1927 936.1
1928 963
1929 990.6
1930 1019
1931 1048
1932 1078
1933 1109
1934 1141
1935 1174
1936 1207
1937 1242
1938 1278
1939 1314
1940 1352
1941 1391
1942 1431
1943 1472
1944 1514
1945 1558
1946 1602
1947 1648
1948 1695
1949 1744
1950 1794
1951 1846
1952 1899
1953 1953
1954 2009
1955 2067
1956 2126
1957 2187
1958 2250
1959 2314
1960 2381
1961 2449
1962 2519
1963 2592
1964 2666
1965 2742
1966 2821
1967 2902
1968 2985
1969 3071
1970 3159
1971 3019
1972 3317
1973 3938
1974 5614
1975 5796
1976 4152
1977 3868
1978 3814
1979 3288
1980 1780
1981 1674
1982 1797
1983 1578
1984 1654
1985 1534
1986 1512
1987 1422
1988 1634
1989 1455
1990 1453
1991 1365
1992 1388
1993 1418
1994 1468
1995 1434
1996 1500
1997 1559
1998 1702
1999 1676
2000 1804
2001 1785
2002 1763
2003 1801
2004 1826
2005 1792
2006 1683
2007 1782
2008 1803
2009 1765
2010 1729
2011 1750
2012 1764
2013 1779
2014 1791
2015 1791
2016 1790
2017 1789
2018 1789
2019 1788