Year Measure
1800 666.9
1801 666.9
1802 666.9
1803 666.9
1804 666.9
1805 666.9
1806 666.9
1807 666.9
1808 666.9
1809 666.9
1810 666.9
1811 666.9
1812 666.9
1813 666.9
1814 666.9
1815 666.9
1816 666.9
1817 666.9
1818 666.9
1819 666.9
1820 666.9
1821 669.8
1822 672.6
1823 675.5
1824 678.4
1825 681.3
1826 684.2
1827 687.2
1828 690.1
1829 693.1
1830 696.1
1831 699
1832 702
1833 705
1834 708.1
1835 711.1
1836 714.2
1837 717.2
1838 720.3
1839 723.4
1840 726.5
1841 729.6
1842 732.7
1843 735.9
1844 739
1845 742.2
1846 745.4
1847 748.6
1848 751.8
1849 755
1850 758.3
1851 761.5
1852 764.8
1853 768
1854 771.3
1855 774.7
1856 778
1857 781.3
1858 784.7
1859 788
1860 791.4
1861 794.8
1862 798.2
1863 801.6
1864 805.1
1865 808.5
1866 812
1867 815.5
1868 819
1869 822.5
1870 826
1871 850
1872 874.7
1873 900.1
1874 926.2
1875 953.1
1876 980.8
1877 1009
1878 1039
1879 1069
1880 1100
1881 1132
1882 1165
1883 1198
1884 1230
1885 1301
1886 1217
1887 1338
1888 1371
1889 1317
1890 1387
1891 1240
1892 1061
1893 1471
1894 1249
1895 1430
1896 1259
1897 1140
1898 1272
1899 1248
1900 1192
1901 1156
1902 1243
1903 1327
1904 1272
1905 1249
1906 1160
1907 1150
1908 1221
1909 1256
1910 1285
1911 1362
1912 1397
1913 1605
1914 1389
1915 1422
1916 1337
1917 1553
1918 1536
1919 1428
1920 1705
1921 1693
1922 1756
1923 2022
1924 2414
1925 3101
1926 3697
1927 3908
1928 4435
1929 4907
1930 4915
1931 4107
1932 4227
1933 4120
1934 4351
1935 4796
1936 4956
1937 5463
1938 5686
1939 5942
1940 5633
1941 5591
1942 5024
1943 5273
1944 6524
1945 7537
1946 8707
1947 10340
1948 11930
1949 11670
1950 11130
1951 11330
1952 11600
1953 11660
1954 12240
1955 12660
1956 13570
1957 14790
1958 13680
1959 13630
1960 13150
1961 12540
1962 12710
1963 12610
1964 13950
1965 14220
1966 13970
1967 14400
1968 14940
1969 14930
1970 15580
1971 15730
1972 15850
1973 16550
1974 17230
1975 17900
1976 19140
1977 19830
1978 19680
1979 19320
1980 18290
1981 17700
1982 16830
1983 15150
1984 14330
1985 13980
1986 14200
1987 14910
1988 15620
1989 14220
1990 14640
1991 15450
1992 16190
1993 15890
1994 14950
1995 14990
1996 14670
1997 15340
1998 15110
1999 13950
2000 14230
2001 14490
2002 12980
2003 11780
2004 13760
2005 14900
2006 16150
2007 17280
2008 17900
2009 17050
2010 16530
2011 16960
2012 17640
2013 17540
2014 17180
2015 16750
2016 16660
2017 16570
2018 16470
2019 16380