Year Measure 1800 1343 1801 1345 1802 1347 1803 1350 1804 1352 1805 1354 1806 1357 1807 1359 1808 1361 1809 1364 1810 1366 1811 1368 1812 1371 1813 1373 1814 1375 1815 1378 1816 1380 1817 1382 1818 1385 1819 1387 1820 1389 1821 1442 1822 1451 1823 1432 1824 1456 1825 1451 1826 1456 1827 1485 1828 1495 1829 1461 1830 1470 1831 1459 1832 1501 1833 1483 1834 1552 1835 1532 1836 1523 1837 1553 1838 1553 1839 1560 1840 1600 1841 1585 1842 1580 1843 1659 1844 1719 1845 1749 1846 1771 1847 1749 1848 1825 1849 1917 1850 2006 1851 1889 1852 1937 1853 1928 1854 1918 1855 2105 1856 1963 1857 1972 1858 1936 1859 2043 1860 2003 1861 2012 1862 2051 1863 2159 1864 2119 1865 2171 1866 2156 1867 2136 1868 2154 1869 2258 1870 2335 1871 2326 1872 2439 1873 2406 1874 2456 1875 2477 1876 2503 1877 2407 1878 2476 1879 2534 1880 2576 1881 2581 1882 2653 1883 2726 1884 2713 1885 2704 1886 2781 1887 2854 1888 2851 1889 2868 1890 3020 1891 3062 1892 3117 1893 3158 1894 3197 1895 3337 1896 3421 1897 3458 1898 3471 1899 3575 1900 3658 1901 3769 1902 3819 1903 4006 1904 4054 1905 4085 1906 4158 1907 4267 1908 4353 1909 4470 1910 4553 1911 4746 1912 4697 1913 4827 1914 5078 1915 4673 1916 4820 1917 4486 1918 4295 1919 4800 1920 4971 1921 4771 1922 5202 1923 5699 1924 5669 1925 5488 1926 5771 1927 5854 1928 6022 1929 6396 1930 6739 1931 6771 1932 6540 1933 6702 1934 6853 1935 6960 1936 7090 1937 7219 1938 7349 1939 7653 1940 6542 1941 5856 1942 5934 1943 6521 1944 7125 1945 6521 1946 7445 1947 7788 1948 7925 1949 8404 1950 8996 1951 8999 1952 9036 1953 9485 1954 9602 1955 9646 1956 9715 1957 10420 1958 10600 1959 11330 1960 11570 1961 12240 1962 12830 1963 12830 1964 13940 1965 14480 1966 14770 1967 15160 1968 15710 1969 16650 1970 16880 1971 17230 1972 18060 1973 18630 1974 18390 1975 18240 1976 19400 1977 19680 1978 19930 1979 20620 1980 20530 1981 20380 1982 21040 1983 21610 1984 22600 1985 23590 1986 24450 1987 24520 1988 24830 1989 24910 1990 25210 1991 25500 1992 25960 1993 25880 1994 27260 1995 27990 1996 28660 1997 29490 1998 30060 1999 30770 2000 31810 2001 31960 2002 32040 2003 32090 2004 32690 2005 33630 2006 34660 2007 35090 2008 34630 2009 32460 2010 32830 2011 33040 2012 32730 2013 32940 2014 33270 2015 33670 2016 34070 2017 34480 2018 34900