Year Measure
1800 855.7
1801 856
1802 856.4
1803 856.8
1804 857.2
1805 857.6
1806 858
1807 858.4
1808 858.8
1809 859.2
1810 859.6
1811 860
1812 860.4
1813 860.8
1814 861.2
1815 861.6
1816 862
1817 862.4
1818 862.8
1819 863.2
1820 863.6
1821 864
1822 864.4
1823 864.8
1824 865.1
1825 865.5
1826 865.9
1827 866.3
1828 866.7
1829 867.1
1830 867.5
1831 867.9
1832 868.3
1833 868.7
1834 869.1
1835 869.5
1836 869.9
1837 870.3
1838 870.7
1839 871.1
1840 871.5
1841 871.9
1842 872.3
1843 872.7
1844 873.1
1845 873.5
1846 873.9
1847 874.3
1848 874.7
1849 875.2
1850 875.6
1851 876
1852 876.4
1853 876.8
1854 877.2
1855 877.6
1856 878
1857 878.4
1858 878.8
1859 879.2
1860 879.6
1861 880
1862 880.4
1863 880.8
1864 881.2
1865 881.6
1866 882
1867 882.4
1868 882.8
1869 883.2
1870 883.6
1871 884
1872 884.5
1873 884.9
1874 885.3
1875 885.7
1876 886.1
1877 886.5
1878 886.9
1879 887.3
1880 887.7
1881 888.1
1882 888.5
1883 888.9
1884 889.4
1885 889.8
1886 890.2
1887 890.6
1888 891
1889 891.4
1890 891.8
1891 892.2
1892 892.6
1893 893
1894 893.4
1895 893.9
1896 894.3
1897 894.7
1898 895.1
1899 895.5
1900 895.9
1901 897.4
1902 899
1903 900.5
1904 902
1905 903.5
1906 905.1
1907 906.6
1908 908.1
1909 909.7
1910 911.2
1911 912.7
1912 914.3
1913 915.8
1914 917.4
1915 918.9
1916 920.5
1917 922
1918 923.6
1919 925.2
1920 926.7
1921 928.3
1922 929.9
1923 931.4
1924 933
1925 934.6
1926 936.2
1927 937.8
1928 939.3
1929 940.9
1930 942.5
1931 944.1
1932 945.7
1933 947.3
1934 948.9
1935 950.5
1936 952.1
1937 953.7
1938 955.3
1939 957
1940 958.6
1941 960.2
1942 961.8
1943 963.5
1944 965.1
1945 966.7
1946 968.4
1947 970
1948 971.6
1949 973.3
1950 974.9
1951 1007
1952 1014
1953 1028
1954 1059
1955 1066
1956 1077
1957 1089
1958 1089
1959 1119
1960 1158
1961 1309
1962 1253
1963 1223
1964 1264
1965 1358
1966 1533
1967 1536
1968 1508
1969 1617
1970 1411
1971 1523
1972 1580
1973 1600
1974 1856
1975 1685
1976 1820
1977 1849
1978 1698
1979 1911
1980 1667
1981 1601
1982 1747
1983 1487
1984 1398
1985 1237
1986 1257
1987 1279
1988 1363
1989 1404
1990 1409
1991 1385
1992 1391
1993 1420
1994 1419
1995 1319
1996 1350
1997 1366
1998 1366
1999 1406
2000 1436
2001 1471
2002 1381
2003 1429
2004 1486
2005 1518
2006 1491
2007 1503
2008 1545
2009 1600
2010 1659
2011 1545
2012 1583
2013 1638
2014 1711
2015 1782
2016 1830
2017 1879
2018 1929
2019 1981