Year Measure 1800 1521 1801 1521 1802 1521 1803 1521 1804 1521 1805 1521 1806 1521 1807 1521 1808 1521 1809 1521 1810 1521 1811 1521 1812 1521 1813 1521 1814 1521 1815 1521 1816 1521 1817 1521 1818 1521 1819 1521 1820 1521 1821 1531 1822 1541 1823 1551 1824 1562 1825 1572 1826 1582 1827 1593 1828 1603 1829 1614 1830 1625 1831 1635 1832 1646 1833 1657 1834 1668 1835 1679 1836 1690 1837 1701 1838 1713 1839 1724 1840 1735 1841 1747 1842 1758 1843 1770 1844 1782 1845 1793 1846 1805 1847 1817 1848 1829 1849 1841 1850 1853 1851 1866 1852 1878 1853 1890 1854 1903 1855 1915 1856 1928 1857 1941 1858 1954 1859 1967 1860 1980 1861 1993 1862 2006 1863 2019 1864 2032 1865 2046 1866 2059 1867 2073 1868 2087 1869 2100 1870 2114 1871 2128 1872 2142 1873 2157 1874 2171 1875 2185 1876 2200 1877 2214 1878 2229 1879 2243 1880 2258 1881 2273 1882 2288 1883 2303 1884 2319 1885 2334 1886 2349 1887 2365 1888 2380 1889 2396 1890 2412 1891 2428 1892 2444 1893 2460 1894 2476 1895 2493 1896 2509 1897 2526 1898 2543 1899 2559 1900 2576 1901 2593 1902 2610 1903 2628 1904 2645 1905 2662 1906 2680 1907 2698 1908 2716 1909 2734 1910 2752 1911 2770 1912 2788 1913 2807 1914 2907 1915 3012 1916 3120 1917 3233 1918 3349 1919 3469 1920 3594 1921 3723 1922 3857 1923 3996 1924 4140 1925 4289 1926 4443 1927 4603 1928 4768 1929 4940 1930 5118 1931 5302 1932 5492 1933 5690 1934 5894 1935 6106 1936 6326 1937 6554 1938 6789 1939 7034 1940 7287 1941 7549 1942 7820 1943 8101 1944 8393 1945 8695 1946 9007 1947 9331 1948 9667 1949 10010 1950 10370 1951 10750 1952 11130 1953 11540 1954 11950 1955 12380 1956 12830 1957 13290 1958 13760 1959 14260 1960 14770 1961 15550 1962 16320 1963 17140 1964 18030 1965 19010 1966 19840 1967 20850 1968 21750 1969 22900 1970 20960 1971 20760 1972 19590 1973 20660 1974 16880 1975 14100 1976 14530 1977 15520 1978 17350 1979 21410 1980 22310 1981 21200 1982 22060 1983 23060 1984 23130 1985 23610 1986 23770 1987 24220 1988 24340 1989 24470 1990 23650 1991 22240 1992 20980 1993 20640 1994 20890 1995 21420 1996 21940 1997 22660 1998 23830 1999 24420 2000 24530 2001 24400 2002 24620 2003 24550 2004 24550 2005 24850 2006 25170 2007 25230 2008 24350 2009 22900 2010 22690 2011 22810 2012 22970 2013 23140 2014 23410 2015 23800 2016 24200 2017 24530 2018 24860 2019 25150