Year Measure
1800 920
1801 920
1802 920
1803 920
1804 920
1805 920
1806 920
1807 920
1808 920
1809 920
1810 920
1811 920
1812 920
1813 920
1814 920
1815 920
1816 920
1817 920
1818 920
1819 920
1820 920
1821 921.5
1822 922.9
1823 924.4
1824 925.9
1825 927.4
1826 928.9
1827 930.3
1828 931.8
1829 933.3
1830 934.8
1831 936.3
1832 937.8
1833 939.3
1834 940.8
1835 942.3
1836 943.8
1837 945.3
1838 946.8
1839 948.3
1840 949.9
1841 951.4
1842 952.9
1843 954.4
1844 955.9
1845 957.5
1846 959
1847 960.5
1848 962.1
1849 963.6
1850 965.1
1851 966.7
1852 968.2
1853 969.8
1854 971.3
1855 972.9
1856 974.4
1857 976
1858 977.5
1859 979.1
1860 980.7
1861 982.2
1862 983.8
1863 985.4
1864 987
1865 988.5
1866 990.1
1867 991.7
1868 993.3
1869 994.9
1870 996.5
1871 998
1872 999.6
1873 1001
1874 1003
1875 1004
1876 1006
1877 1008
1878 1009
1879 1011
1880 1012
1881 1014
1882 1016
1883 1017
1884 1019
1885 1021
1886 1022
1887 1024
1888 1026
1889 1027
1890 1029
1891 1030
1892 1032
1893 1034
1894 1035
1895 1037
1896 1039
1897 1040
1898 1042
1899 1044
1900 1045
1901 1047
1902 1049
1903 1050
1904 1052
1905 1054
1906 1055
1907 1057
1908 1059
1909 1060
1910 1062
1911 1064
1912 1066
1913 1067
1914 1088
1915 1109
1916 1131
1917 1153
1918 1176
1919 1199
1920 1222
1921 1246
1922 1271
1923 1296
1924 1321
1925 1347
1926 1373
1927 1400
1928 1428
1929 1455
1930 1484
1931 1513
1932 1543
1933 1573
1934 1604
1935 1635
1936 1667
1937 1700
1938 1733
1939 1767
1940 1802
1941 1837
1942 1873
1943 1909
1944 1947
1945 1985
1946 2024
1947 2063
1948 2104
1949 2145
1950 2187
1951 2191
1952 2194
1953 2207
1954 2218
1955 2229
1956 2181
1957 2134
1958 2087
1959 2041
1960 1997
1961 2016
1962 2035
1963 2055
1964 2075
1965 2095
1966 2158
1967 2223
1968 2290
1969 2359
1970 2429
1971 2501
1972 2508
1973 2546
1974 2631
1975 2751
1976 2994
1977 3080
1978 3109
1979 3189
1980 3414
1981 3260
1982 3512
1983 3400
1984 3450
1985 3572
1986 3755
1987 3580
1988 3851
1989 3847
1990 3901
1991 4119
1992 3930
1993 3825
1994 4197
1995 3870
1996 4325
1997 4177
1998 4448
1999 4414
2000 4430
2001 4710
2002 4815
2003 5067
2004 5259
2005 5363
2006 5725
2007 5825
2008 6091
2009 6313
2010 6466
2011 6698
2012 6807
2013 7045
2014 7248
2015 7529
2016 7843
2017 8187
2018 8566
2019 8962