Year Measure
1820 822.6
1821 830
1822 837.5
1823 845.1
1824 852.8
1825 860.5
1826 868.3
1827 876.2
1828 884.1
1829 892.1
1830 900.2
1831 908.3
1832 916.5
1833 924.8
1834 933.2
1835 941.7
1836 950.2
1837 958.8
1838 967.5
1839 976.2
1840 985.1
1841 994
1842 1003
1843 1012
1844 1021
1845 1030
1846 1040
1847 1049
1848 1059
1849 1068
1850 1078
1851 1088
1852 1098
1853 1108
1854 1118
1855 1128
1856 1138
1857 1148
1858 1159
1859 1169
1860 1180
1861 1190
1862 1201
1863 1212
1864 1223
1865 1234
1866 1245
1867 1257
1868 1268
1869 1279
1870 1291
1871 1303
1872 1314
1873 1326
1874 1338
1875 1350
1876 1363
1877 1375
1878 1387
1879 1400
1880 1413
1881 1426
1882 1438
1883 1451
1884 1465
1885 1478
1886 1491
1887 1505
1888 1518
1889 1532
1890 1546
1891 1560
1892 1574
1893 1588
1894 1603
1895 1617
1896 1632
1897 1647
1898 1662
1899 1677
1900 1692
1901 1707
1902 1723
1903 1738
1904 1754
1905 1770
1906 1786
1907 1802
1908 1818
1909 1835
1910 1851
1911 1868
1912 1885
1913 1902
1914 1919
1915 1937
1916 1954
1917 1972
1918 1990
1919 2008
1920 2026
1921 2044
1922 2063
1923 2082
1924 2100
1925 2119
1926 2139
1927 2158
1928 2178
1929 2197
1930 2217
1931 2237
1932 2257
1933 2278
1934 2299
1935 2319
1936 2340
1937 2362
1938 2383
1939 2404
1940 2426
1941 2448
1942 2470
1943 2493
1944 2515
1945 2538
1946 2561
1947 2584
1948 2608
1949 2631
1950 2655
1951 2679
1952 2703
1953 2728
1954 2753
1955 2778
1956 2803
1957 2828
1958 2854
1959 2879
1960 2906
1961 2938
1962 2843
1963 2848
1964 2907
1965 3097
1966 3415
1967 3636
1968 3989
1969 4231
1970 4755
1971 4908
1972 5215
1973 5723
1974 6255
1975 7393
1976 8495
1977 9281
1978 10030
1979 10840
1980 11500
1981 11870
1982 12230
1983 12320
1984 12650
1985 13230
1986 13610
1987 14030
1988 15080
1989 16170
1990 17040
1991 17950
1992 18620
1993 19270
1994 20180
1995 21190
1996 21920
1997 22790
1998 23470
1999 24210
2000 25610
2001 25000
2002 25460
2003 25220
2004 25100
2005 25780
2006 26290
2007 27170
2008 28060
2009 27100
2010 27830
2011 28180
2012 28380
2013 29020
2014 29510
2015 29990
2016 30440
2017 30870
2018 31320
2019 31480