Year Measure
1820 878.6
1821 880.5
1822 882.4
1823 884.3
1824 886.1
1825 888
1826 889.9
1827 891.8
1828 893.7
1829 895.6
1830 897.5
1831 899.4
1832 901.3
1833 903.3
1834 905.2
1835 907.1
1836 909
1837 911
1838 912.9
1839 914.9
1840 916.8
1841 918.8
1842 920.7
1843 922.7
1844 924.6
1845 926.6
1846 928.6
1847 930.6
1848 932.5
1849 934.5
1850 936.5
1851 938.5
1852 940.5
1853 942.5
1854 944.5
1855 946.5
1856 948.5
1857 950.6
1858 952.6
1859 954.6
1860 956.6
1861 958.7
1862 960.7
1863 962.8
1864 964.8
1865 966.9
1866 968.9
1867 971
1868 973
1869 975.1
1870 977.2
1871 991.6
1872 1006
1873 1021
1874 1036
1875 1051
1876 1067
1877 1083
1878 1099
1879 1115
1880 1131
1881 1148
1882 1165
1883 1182
1884 1199
1885 1217
1886 1235
1887 1253
1888 1272
1889 1290
1890 1309
1891 1327
1892 1346
1893 1364
1894 1383
1895 1402
1896 1421
1897 1440
1898 1460
1899 1480
1900 1500
1901 1520
1902 1540
1903 1560
1904 1581
1905 1601
1906 1622
1907 1644
1908 1665
1909 1687
1910 1709
1911 1731
1912 1753
1913 1776
1914 1791
1915 1806
1916 1821
1917 1836
1918 1851
1919 1867
1920 1882
1921 1898
1922 1914
1923 1930
1924 1946
1925 1963
1926 1979
1927 1996
1928 2012
1929 2029
1930 2037
1931 2044
1932 2052
1933 2059
1934 2067
1935 2075
1936 2082
1937 2090
1938 2098
1939 2106
1940 2114
1941 2121
1942 2129
1943 2137
1944 2145
1945 2153
1946 2161
1947 2169
1948 2177
1949 2185
1950 2193
1951 2288
1952 2292
1953 2384
1954 2454
1955 2587
1956 2613
1957 2780
1958 2905
1959 3025
1960 3178
1961 3205
1962 3311
1963 3424
1964 3541
1965 3670
1966 3808
1967 3951
1968 4094
1969 4233
1970 4389
1971 4564
1972 4743
1973 4979
1974 4998
1975 5015
1976 5035
1977 5057
1978 5080
1979 5105
1980 5141
1981 5169
1982 5197
1983 5228
1984 5257
1985 5285
1986 5318
1987 5352
1988 5386
1989 5426
1990 5475
1991 3890
1992 3575
1993 3889
1994 4178
1995 4703
1996 5110
1997 4571
1998 5131
1999 5623
2000 6005
2001 6407
2002 6591
2003 6950
2004 7322
2005 7685
2006 8090
2007 8528
2008 9112
2009 9377
2010 9657
2011 9897
2012 10120
2013 10300
2014 10570
2015 10970
2016 11490
2017 12060
2018 12670
2019 13330