Year Measure
1800 585.6
1801 585.7
1802 585.9
1803 586
1804 586.1
1805 586.3
1806 586.4
1807 586.5
1808 586.7
1809 586.8
1810 586.9
1811 587.1
1812 587.2
1813 587.3
1814 587.5
1815 587.6
1816 587.7
1817 587.9
1818 588
1819 588.1
1820 588.3
1821 591.5
1822 594.8
1823 598
1824 601.3
1825 604.6
1826 608
1827 611.3
1828 614.7
1829 618.1
1830 621.5
1831 624.9
1832 628.4
1833 631.8
1834 635.3
1835 638.8
1836 642.3
1837 645.9
1838 649.4
1839 653
1840 656.6
1841 660.2
1842 663.9
1843 667.5
1844 671.2
1845 674.9
1846 678.6
1847 682.4
1848 686.1
1849 689.9
1850 693.7
1851 697.5
1852 701.4
1853 705.3
1854 709.1
1855 713
1856 717
1857 720.9
1858 724.9
1859 728.9
1860 732.9
1861 737
1862 741
1863 745.1
1864 749.2
1865 753.3
1866 757.5
1867 761.7
1868 765.9
1869 770.1
1870 774.3
1871 778.6
1872 782.9
1873 787.2
1874 791.5
1875 795.9
1876 800.3
1877 804.7
1878 809.1
1879 813.6
1880 818.1
1881 822.6
1882 827.1
1883 831.7
1884 836.3
1885 840.9
1886 807.8
1887 943.7
1888 907.1
1889 842.8
1890 838.6
1891 767.5
1892 839.6
1893 950.6
1894 1080
1895 998.6
1896 1099
1897 1080
1898 1107
1899 1174
1900 1148
1901 1176
1902 1277
1903 1188
1904 1312
1905 1160
1906 1108
1907 1064
1908 1161
1909 1204
1910 1284
1911 1185
1912 1280
1913 1343
1914 1282
1915 1318
1916 1171
1917 1027
1918 628.4
1919 541.3
1920 543.1
1921 496.7
1922 576.1
1923 663
1924 839.2
1925 1048
1926 1176
1927 1224
1928 1286
1929 1300
1930 1357
1931 1368
1932 1346
1933 1396
1934 1522
1935 1739
1936 1856
1937 2008
1938 2001
1939 2081
1940 1992
1941 1953
1942 1915
1943 1878
1944 1841
1945 1805
1946 1770
1947 1965
1948 2218
1949 2420
1950 2619
1951 2584
1952 2703
1953 2770
1954 2854
1955 3041
1956 3272
1957 3278
1958 3459
1959 3358
1960 3607
1961 3747
1962 3786
1963 3644
1964 4059
1965 4237
1966 4392
1967 4538
1968 4756
1969 4778
1970 5098
1971 5182
1972 5160
1973 5540
1974 5500
1975 5322
1976 5377
1977 5312
1978 5258
1979 5054
1980 4888
1981 4765
1982 4716
1983 4700
1984 4593
1985 4473
1986 4496
1987 4398
1988 4339
1989 4268
1990 4030
1991 3588
1992 2377
1993 1961
1994 1520
1995 1310
1996 1073
1997 1072
1998 1108
1999 1126
2000 1195
2001 1289
2002 1382
2003 1491
2004 1614
2005 1686
2006 1767
2007 1865
2008 1969
2009 2004
2010 2110
2011 2212
2012 2329
2013 2450
2014 2548
2015 2639
2016 2734
2017 2832
2018 2933
2019 3038