Year Measure 1800 1316 1801 1318 1802 1320 1803 1323 1804 1325 1805 1327 1806 1329 1807 1332 1808 1334 1809 1336 1810 1338 1811 1341 1812 1343 1813 1345 1814 1348 1815 1350 1816 1352 1817 1354 1818 1357 1819 1359 1820 1361 1821 1368 1822 1375 1823 1382 1824 1389 1825 1397 1826 1404 1827 1411 1828 1418 1829 1426 1830 1433 1831 1440 1832 1448 1833 1455 1834 1463 1835 1470 1836 1478 1837 1485 1838 1493 1839 1501 1840 1508 1841 1516 1842 1524 1843 1532 1844 1540 1845 1548 1846 1555 1847 1563 1848 1572 1849 1580 1850 1588 1851 1596 1852 1604 1853 1612 1854 1621 1855 1629 1856 1638 1857 1646 1858 1655 1859 1663 1860 1672 1861 1669 1862 1562 1863 1669 1864 1688 1865 1658 1866 1670 1867 1544 1868 1749 1869 1920 1870 1986 1871 1964 1872 1996 1873 2080 1874 2099 1875 2111 1876 2195 1877 2111 1878 2044 1879 2035 1880 2013 1881 1935 1882 2097 1883 2144 1884 2125 1885 2146 1886 2223 1887 2223 1888 2270 1889 2312 1890 2407 1891 2354 1892 2231 1893 2337 1894 2439 1895 2601 1896 2736 1897 2831 1898 2908 1899 2801 1900 2908 1901 2852 1902 2774 1903 2938 1904 3017 1905 3036 1906 3127 1907 3197 1908 3188 1909 3284 1910 3323 1911 3380 1912 3525 1913 3679 1914 3487 1915 3280 1916 3299 1917 2755 1918 2388 1919 2890 1920 3217 1921 3285 1922 3587 1923 3812 1924 3876 1925 4058 1926 4169 1927 4457 1928 4719 1929 4735 1930 4646 1931 4498 1932 4444 1933 4709 1934 5209 1935 5390 1936 5715 1937 5998 1938 6256 1939 5939 1940 5613 1941 5790 1942 5799 1943 6443 1944 6422 1945 6012 1946 6419 1947 6478 1948 6897 1949 7222 1950 7413 1951 7967 1952 8147 1953 8108 1954 8718 1955 9058 1956 9230 1957 9569 1958 9542 1959 10030 1960 10860 1961 11600 1962 11890 1963 12190 1964 12740 1965 13370 1966 13640 1967 13850 1968 14110 1969 15470 1970 16690 1971 17020 1972 18210 1973 19320 1974 19800 1975 19940 1976 19800 1977 19790 1978 20150 1979 21490 1980 22570 1981 22890 1982 23500 1983 24000 1984 24590 1985 25310 1986 25830 1987 26810 1988 28040 1989 29540 1990 29400 1991 27370 1992 26180 1993 25740 1994 26640 1995 27460 1996 28410 1997 30090 1998 31710 1999 32870 2000 34460 2001 35290 2002 35770 2003 36330 2004 37600 2005 38640 2006 40180 2007 42140 2008 42060 2009 38280 2010 39380 2011 40280 2012 39690 2013 38960 2014 38920 2015 39170 2016 39610 2017 40110 2018 40670 2019 41240