Year Measure 1800 1505 1801 1507 1802 1508 1803 1510 1804 1512 1805 1513 1806 1515 1807 1516 1808 1518 1809 1519 1810 1521 1811 1523 1812 1524 1813 1526 1814 1527 1815 1529 1816 1531 1817 1532 1818 1534 1819 1535 1820 1537 1821 1547 1822 1556 1823 1566 1824 1576 1825 1586 1826 1596 1827 1606 1828 1617 1829 1627 1830 1637 1831 1647 1832 1658 1833 1668 1834 1679 1835 1690 1836 1700 1837 1711 1838 1722 1839 1733 1840 1744 1841 1755 1842 1766 1843 1777 1844 1788 1845 1800 1846 1811 1847 1823 1848 1834 1849 1846 1850 1857 1851 1869 1852 1881 1853 1893 1854 1905 1855 1917 1856 1929 1857 1941 1858 1954 1859 1966 1860 1978 1861 1991 1862 2004 1863 2016 1864 2029 1865 2042 1866 2055 1867 2068 1868 2081 1869 2094 1870 2107 1871 2121 1872 2134 1873 2148 1874 2161 1875 2175 1876 2189 1877 2202 1878 2216 1879 2230 1880 2245 1881 2259 1882 2273 1883 2288 1884 2302 1885 2317 1886 2227 1887 2604 1888 2505 1889 2329 1890 2320 1891 2125 1892 2326 1893 2636 1894 2997 1895 2774 1896 3055 1897 3004 1898 3083 1899 3272 1900 3202 1901 3282 1902 3566 1903 3320 1904 3671 1905 3250 1906 3106 1907 2984 1908 3259 1909 3384 1910 3611 1911 3336 1912 3604 1913 3786 1914 3616 1915 3721 1916 3308 1917 2905 1918 1778 1919 1533 1920 1539 1921 1409 1922 1636 1923 1884 1924 2387 1925 2983 1926 3349 1927 3488 1928 3668 1929 3711 1930 3879 1931 3914 1932 3853 1933 3998 1934 4365 1935 4991 1936 5331 1937 5773 1938 5757 1939 5990 1940 5740 1941 5633 1942 5527 1943 5423 1944 5321 1945 5222 1946 5124 1947 5693 1948 6432 1949 7025 1950 7609 1951 7514 1952 7864 1953 8067 1954 8318 1955 8871 1956 9550 1957 9575 1958 10110 1959 9825 1960 10570 1961 10970 1962 11090 1963 10670 1964 11890 1965 12410 1966 12860 1967 13290 1968 13930 1969 13990 1970 14930 1971 15180 1972 15110 1973 16230 1974 16570 1975 16500 1976 17150 1977 17440 1978 17760 1979 17570 1980 17480 1981 17540 1982 17860 1983 18310 1984 18410 1985 18450 1986 19080 1987 19210 1988 19500 1989 19740 1990 19180 1991 18180 1992 15530 1993 14180 1994 12380 1995 11860 1996 11450 1997 11630 1998 11030 1999 11780 2000 13010 2001 13740 2002 14470 2003 15620 2004 16830 2005 18000 2006 19550 2007 21280 2008 22400 2009 20670 2010 21570 2011 22570 2012 23320 2013 23630 2014 23960 2015 24530 2016 25150 2017 25790 2018 26450 2019 27130