Year Measure
1820 718.4
1821 721.7
1822 725.1
1823 728.5
1824 731.9
1825 735.4
1826 738.8
1827 742.3
1828 745.7
1829 749.2
1830 752.8
1831 756.3
1832 759.8
1833 763.4
1834 767
1835 770.6
1836 774.2
1837 777.8
1838 781.5
1839 785.1
1840 788.8
1841 792.5
1842 796.2
1843 800
1844 803.7
1845 807.5
1846 811.3
1847 815.1
1848 818.9
1849 822.7
1850 826.6
1851 830.5
1852 834.4
1853 838.3
1854 842.2
1855 846.1
1856 850.1
1857 854.1
1858 858.1
1859 862.1
1860 866.2
1861 870.2
1862 874.3
1863 878.4
1864 882.5
1865 886.7
1866 890.8
1867 895
1868 899.2
1869 903.4
1870 907.7
1871 911.9
1872 916.2
1873 920.5
1874 924.8
1875 929.1
1876 933.5
1877 937.9
1878 942.3
1879 946.7
1880 951.1
1881 955.6
1882 960.1
1883 964.6
1884 969.1
1885 973.6
1886 978.2
1887 982.8
1888 987.4
1889 992
1890 996.7
1891 1001
1892 1006
1893 1011
1894 1016
1895 1020
1896 1025
1897 1030
1898 1035
1899 1040
1900 1044
1901 1049
1902 1054
1903 1059
1904 1064
1905 1069
1906 1074
1907 1079
1908 1084
1909 1089
1910 1094
1911 1100
1912 1105
1913 1110
1914 1110
1915 1110
1916 1110
1917 1111
1918 1111
1919 1111
1920 1111
1921 1111
1922 1111
1923 1112
1924 1112
1925 1112
1926 1112
1927 1112
1928 1112
1929 1113
1930 1113
1931 1113
1932 1113
1933 1113
1934 1113
1935 1114
1936 1114
1937 1114
1938 1114
1939 1114
1940 1114
1941 1114
1942 1115
1943 1115
1944 1115
1945 1115
1946 1115
1947 1115
1948 1116
1949 1116
1950 1116
1951 1135
1952 1153
1953 1171
1954 1189
1955 1207
1956 1225
1957 1242
1958 1258
1959 1275
1960 1356
1961 1415
1962 1432
1963 1465
1964 1635
1965 1811
1966 1927
1967 1982
1968 2028
1969 2189
1970 2091
1971 2188
1972 2213
1973 2075
1974 2113
1975 2052
1976 1995
1977 2056
1978 2213
1979 2290
1980 2132
1981 1940
1982 1803
1983 1647
1984 1638
1985 1655
1986 1648
1987 1612
1988 1626
1989 1627
1990 1556
1991 1494
1992 1387
1993 1166
1994 1361
1995 1376
1996 1440
1997 1317
1998 1251
1999 1252
2000 1194
2001 1169
2002 1189
2003 1217
2004 1212
2005 1191
2006 1209
2007 1206
2008 1204
2009 1220
2010 1241
2011 1273
2012 1314
2013 1352
2014 1396
2015 1442
2016 1491
2017 1537
2018 1580
2019 1619