Year Measure
1800 883
1801 883
1802 883
1803 883
1804 883
1805 883
1806 883
1807 883
1808 883
1809 883
1810 883
1811 883
1812 883
1813 883
1814 883
1815 883
1816 883
1817 883
1818 883
1819 883
1820 883
1821 885.9
1822 888.8
1823 891.6
1824 894.5
1825 897.4
1826 900.4
1827 903.3
1828 906.2
1829 909.2
1830 912.1
1831 915.1
1832 918
1833 921
1834 924
1835 927
1836 930
1837 933
1838 936.1
1839 939.1
1840 942.2
1841 945.2
1842 948.3
1843 951.4
1844 954.5
1845 957.6
1846 960.7
1847 963.8
1848 966.9
1849 970.1
1850 973.2
1851 976.4
1852 979.5
1853 982.7
1854 985.9
1855 989.1
1856 992.3
1857 995.5
1858 998.8
1859 1002
1860 1005
1861 1009
1862 1012
1863 1015
1864 1018
1865 1022
1866 1025
1867 1028
1868 1032
1869 1035
1870 1038
1871 1042
1872 1045
1873 1049
1874 1052
1875 1055
1876 1059
1877 1062
1878 1066
1879 1069
1880 1073
1881 1076
1882 1080
1883 1083
1884 1087
1885 1090
1886 1094
1887 1097
1888 1101
1889 1104
1890 1108
1891 1112
1892 1115
1893 1119
1894 1122
1895 1126
1896 1130
1897 1133
1898 1137
1899 1141
1900 1144
1901 1148
1902 1152
1903 1156
1904 1159
1905 1163
1906 1167
1907 1171
1908 1175
1909 1178
1910 1182
1911 1186
1912 1190
1913 1194
1914 1261
1915 1332
1916 1407
1917 1486
1918 1570
1919 1658
1920 1751
1921 1850
1922 1954
1923 2064
1924 2180
1925 2302
1926 2432
1927 2569
1928 2713
1929 2866
1930 3027
1931 3198
1932 3378
1933 3568
1934 3768
1935 3980
1936 4204
1937 4441
1938 4691
1939 4955
1940 5234
1941 5528
1942 5839
1943 6168
1944 6515
1945 6881
1946 7268
1947 7677
1948 8109
1949 8566
1950 9048
1951 9557
1952 10090
1953 10660
1954 11260
1955 11900
1956 12570
1957 13270
1958 14020
1959 14810
1960 15640
1961 16520
1962 17450
1963 18430
1964 19470
1965 20570
1966 21720
1967 22950
1968 24240
1969 25600
1970 27040
1971 26070
1972 28700
1973 34260
1974 49070
1975 51290
1976 37390
1977 35640
1978 35990
1979 32520
1980 17470
1981 15420
1982 15610
1983 15070
1984 15040
1985 13340
1986 13010
1987 12640
1988 15040
1989 15380
1990 16110
1991 15130
1992 13800
1993 11770
1994 12290
1995 13250
1996 14230
1997 14160
1998 14070
1999 13020
2000 12810
2001 12800
2002 12220
2003 11970
2004 12490
2005 13100
2006 13430
2007 13640
2008 13430
2009 13740
2010 13920
2011 14080
2012 15140
2013 15170
2014 15280
2015 15470
2016 15700
2017 15930
2018 16120
2019 16310