Year Measure
1764 882.6
1765 884
1766 885.4
1767 886.8
1768 888.2
1769 889.6
1770 891
1771 892.4
1772 893.9
1773 895.3
1774 896.7
1775 898.1
1776 899.5
1777 901
1778 902.4
1779 903.8
1780 905.3
1781 906.7
1782 908.1
1783 909.6
1784 911
1785 912.5
1786 913.9
1787 915.4
1788 916.8
1789 918.3
1790 919.7
1791 921.2
1792 922.6
1793 924.1
1794 925.6
1795 927
1796 928.5
1797 930
1798 931.5
1799 932.9
1800 934.4
1801 935.9
1802 937.4
1803 938.9
1804 940.4
1805 941.8
1806 943.3
1807 944.8
1808 946.3
1809 947.8
1810 949.3
1811 950.8
1812 952.4
1813 953.9
1814 955.4
1815 956.9
1816 958.4
1817 959.9
1818 961.5
1819 963
1820 964.5
1821 972.3
1822 980.2
1823 988.1
1824 996.1
1825 1004
1826 1012
1827 1020
1828 1029
1829 1037
1830 1045
1831 1054
1832 1062
1833 1071
1834 1080
1835 1088
1836 1097
1837 1106
1838 1115
1839 1124
1840 1133
1841 1142
1842 1151
1843 1161
1844 1170
1845 1179
1846 1189
1847 1199
1848 1208
1849 1218
1850 1228
1851 1233
1852 1237
1853 1242
1854 1247
1855 1251
1856 1256
1857 1261
1858 1265
1859 1270
1860 1275
1861 1280
1862 1285
1863 1290
1864 1294
1865 1299
1866 1304
1867 1309
1868 1314
1869 1319
1870 1324
1871 1344
1872 1363
1873 1383
1874 1404
1875 1424
1876 1445
1877 1466
1878 1488
1879 1510
1880 1532
1881 1554
1882 1577
1883 1601
1884 1624
1885 1648
1886 1672
1887 1697
1888 1722
1889 1747
1890 1773
1891 1797
1892 1822
1893 1847
1894 1872
1895 1898
1896 1924
1897 1951
1898 1978
1899 2005
1900 2033
1901 2059
1902 2085
1903 2111
1904 2138
1905 2165
1906 2193
1907 2220
1908 2249
1909 2277
1910 2306
1911 2335
1912 2365
1913 2395
1914 2455
1915 2517
1916 2580
1917 2644
1918 2711
1919 2779
1920 2848
1921 2920
1922 2993
1923 3035
1924 3145
1925 3276
1926 3342
1927 3409
1928 3436
1929 3607
1930 3483
1931 3297
1932 3540
1933 3709
1934 3751
1935 3853
1936 3820
1937 4314
1938 4177
1939 4121
1940 3478
1941 2937
1942 2478
1943 2086
1944 1756
1945 1478
1946 2188
1947 2787
1948 2847
1949 2962
1950 3040
1951 3278
1952 3269
1953 3683
1954 3766
1955 4020
1956 4334
1957 4585
1958 4759
1959 4890
1960 5067
1961 5473
1962 5653
1963 6214
1964 6710
1965 7316
1966 7717
1967 8056
1968 8582
1969 9411
1970 10150
1971 10840
1972 12130
1973 12570
1974 12080
1975 12710
1976 13360
1977 13630
1978 14380
1979 14740
1980 14880
1981 14770
1982 14770
1983 14770
1984 15120
1985 15560
1986 15790
1987 15700
1988 16410
1989 16990
1990 16850
1991 17190
1992 17210
1993 16870
1994 17150
1995 17490
1996 17890
1997 18530
1998 19150
1999 19800
2000 20680
2001 21590
2002 22420
2003 23530
2004 24590
2005 25520
2006 26870
2007 27760
2008 27260
2009 26320
2010 24950
2011 23110
2012 21810
2013 20960
2014 21120
2015 21770
2016 22600
2017 23420
2018 24220