Year Measure
1800 963.4
1801 962.3
1802 961.2
1803 960.1
1804 959
1805 957.8
1806 956.7
1807 955.6
1808 954.5
1809 953.4
1810 952.3
1811 951.2
1812 950.1
1813 949
1814 947.9
1815 946.8
1816 945.7
1817 944.6
1818 943.5
1819 942.4
1820 941.3
1821 940.2
1822 939.1
1823 938
1824 936.9
1825 935.8
1826 934.7
1827 933.6
1828 932.6
1829 931.5
1830 930.4
1831 929.3
1832 928.2
1833 927.2
1834 926.1
1835 925
1836 923.9
1837 922.9
1838 921.8
1839 920.7
1840 919.6
1841 918.6
1842 917.5
1843 916.4
1844 915.4
1845 914.3
1846 913.3
1847 912.2
1848 911.1
1849 910.1
1850 909
1851 908
1852 906.9
1853 905.8
1854 904.8
1855 903.7
1856 902.7
1857 901.6
1858 900.6
1859 899.6
1860 898.5
1861 897.5
1862 896.4
1863 895.4
1864 894.3
1865 893.3
1866 892.3
1867 891.2
1868 890.2
1869 889.2
1870 888.1
1871 887.1
1872 886.1
1873 885
1874 884
1875 883
1876 881.9
1877 880.9
1878 879.9
1879 878.9
1880 877.9
1881 876.8
1882 875.8
1883 874.8
1884 873.8
1885 872.8
1886 871.8
1887 870.7
1888 869.7
1889 868.7
1890 867.7
1891 866.7
1892 865.7
1893 864.7
1894 863.7
1895 862.7
1896 861.7
1897 860.7
1898 859.7
1899 858.7
1900 857.7
1901 861
1902 864.2
1903 867.5
1904 870.8
1905 874.2
1906 877.5
1907 880.9
1908 884.2
1909 887.6
1910 891
1911 894.4
1912 922.1
1913 947.3
1914 979.4
1915 1134
1916 1098
1917 1202
1918 1281
1919 1349
1920 1161
1921 1238
1922 1124
1923 1190
1924 1183
1925 1170
1926 1199
1927 1236
1928 1230
1929 1151
1930 1077
1931 1070
1932 1059
1933 1267
1934 1251
1935 1349
1936 1459
1937 1595
1938 1664
1939 1489
1940 1666
1941 1675
1942 1652
1943 1662
1944 1577
1945 734.1
1946 742.6
1947 782.6
1948 841.6
1949 902.9
1950 947.5
1951 791.8
1952 846.2
1953 1093
1954 1153
1955 1217
1956 1277
1957 1391
1958 1569
1959 1514
1960 1604
1961 1680
1962 1641
1963 1620
1964 1630
1965 1663
1966 1644
1967 1670
1968 1693
1969 1659
1970 1710
1971 1711
1972 1741
1973 1762
1974 1792
1975 1854
1976 1860
1977 1893
1978 1817
1979 2023
1980 1894
1981 2079
1982 2186
1983 2143
1984 2210
1985 2125
1986 2109
1987 2144
1988 2199
1989 2258
1990 2076
1991 1973
1992 1745
1993 1619
1994 1605
1995 1442
1996 1393
1997 1230
1998 1267
1999 1377
2000 1287
2001 1368
2002 1375
2003 1405
2004 1410
2005 1464
2006 1461
2007 1392
2008 1427
2009 1407
2010 1393
2011 1397
2012 1393
2013 1392