Year Measure
1800 948.5
1801 948.5
1802 948.5
1803 948.5
1804 948.5
1805 948.5
1806 948.5
1807 948.5
1808 948.5
1809 948.5
1810 948.5
1811 948.5
1812 948.5
1813 948.5
1814 948.5
1815 948.5
1816 948.5
1817 948.5
1818 948.5
1819 948.5
1820 948.5
1821 961.9
1822 975.5
1823 989.3
1824 1003
1825 1017
1826 1032
1827 1046
1828 1061
1829 1076
1830 1091
1831 1107
1832 1122
1833 1138
1834 1154
1835 1171
1836 1187
1837 1204
1838 1221
1839 1238
1840 1256
1841 1273
1842 1291
1843 1310
1844 1328
1845 1347
1846 1366
1847 1385
1848 1405
1849 1425
1850 1445
1851 1465
1852 1486
1853 1507
1854 1528
1855 1550
1856 1572
1857 1594
1858 1616
1859 1639
1860 1662
1861 1686
1862 1710
1863 1734
1864 1758
1865 1783
1866 1808
1867 1834
1868 1860
1869 1886
1870 1913
1871 1940
1872 1967
1873 1995
1874 2023
1875 2052
1876 2032
1877 2179
1878 2002
1879 2027
1880 1926
1881 1897
1882 2330
1883 2540
1884 2641
1885 3015
1886 2933
1887 3042
1888 3435
1889 3662
1890 3246
1891 2971
1892 3457
1893 3555
1894 3988
1895 4298
1896 4621
1897 3610
1898 3807
1899 4365
1900 3721
1901 3931
1902 3740
1903 4169
1904 4496
1905 4965
1906 4984
1907 4858
1908 5109
1909 5124
1910 5259
1911 5143
1912 5358
1913 5199
1914 4453
1915 4299
1916 4100
1917 3697
1918 4311
1919 4395
1920 4639
1921 4617
1922 4845
1923 5232
1924 5480
1925 5290
1926 5400
1927 5635
1928 5830
1929 5938
1930 5530
1931 5043
1932 4781
1933 4917
1934 5213
1935 5342
1936 5303
1937 5604
1938 5533
1939 5658
1940 5661
1941 5869
1942 5842
1943 5711
1944 6266
1945 5967
1946 6361
1947 6921
1948 7139
1949 6881
1950 6805
1951 6924
1952 6433
1953 6647
1954 6794
1955 7146
1956 7215
1957 7462
1958 7790
1959 7156
1960 7601
1961 8017
1962 7763
1963 7457
1964 8111
1965 8730
1966 8658
1967 8764
1968 9015
1969 9654
1970 10030
1971 10240
1972 10280
1973 10480
1974 10870
1975 10630
1976 10460
1977 10970
1978 10450
1979 11020
1980 11020
1981 10250
1982 9792
1983 10050
1984 10120
1985 9278
1986 9823
1987 9946
1988 9626
1989 8823
1990 8539
1991 9333
1992 10130
1993 10600
1994 11110
1995 10670
1996 11150
1997 11940
1998 12270
1999 11720
2000 11500
2001 10870
2002 9574
2003 10320
2004 11140
2005 12040
2006 12910
2007 13870
2008 14650
2009 14610
2010 15770
2011 16970
2012 17100
2013 17630
2014 17520
2015 17500
2016 17560
2017 17710
2018 17860
2019 18020