Year Measure 1800 1360 1801 1362 1802 1363 1803 1365 1804 1366 1805 1368 1806 1370 1807 1371 1808 1373 1809 1375 1810 1376 1811 1378 1812 1380 1813 1381 1814 1383 1815 1384 1816 1386 1817 1388 1818 1389 1819 1391 1820 1393 1821 1408 1822 1423 1823 1438 1824 1454 1825 1469 1826 1485 1827 1501 1828 1517 1829 1533 1830 1550 1831 1567 1832 1583 1833 1600 1834 1618 1835 1635 1836 1653 1837 1670 1838 1688 1839 1707 1840 1725 1841 1743 1842 1762 1843 1781 1844 1800 1845 1820 1846 1839 1847 1859 1848 1879 1849 1899 1850 1920 1851 1940 1852 1961 1853 1982 1854 2003 1855 2025 1856 2047 1857 2069 1858 2091 1859 2114 1860 2136 1861 2159 1862 2182 1863 2206 1864 2230 1865 2254 1866 2278 1867 2302 1868 2327 1869 2352 1870 2377 1871 2403 1872 2429 1873 2455 1874 2481 1875 2508 1876 2535 1877 2562 1878 2590 1879 2618 1880 2646 1881 2674 1882 2703 1883 2732 1884 2761 1885 2791 1886 2821 1887 2851 1888 2882 1889 2913 1890 2944 1891 2976 1892 3008 1893 3040 1894 3073 1895 3106 1896 3140 1897 3173 1898 3207 1899 3242 1900 3277 1901 3312 1902 3348 1903 3384 1904 3420 1905 3457 1906 3494 1907 3532 1908 3570 1909 3608 1910 3647 1911 3686 1912 3726 1913 3766 1914 3782 1915 3798 1916 3815 1917 3831 1918 3848 1919 3864 1920 3881 1921 3898 1922 3915 1923 3932 1924 3949 1925 3966 1926 3983 1927 4000 1928 4017 1929 4035 1930 4052 1931 4070 1932 4087 1933 4105 1934 4123 1935 4141 1936 4158 1937 4176 1938 4195 1939 4213 1940 4231 1941 4249 1942 4268 1943 4286 1944 4305 1945 4323 1946 4342 1947 4361 1948 4379 1949 4398 1950 4417 1951 4360 1952 4453 1953 4430 1954 4651 1955 4678 1956 5027 1957 5481 1958 5564 1959 6453 1960 6759 1961 5824 1962 4639 1963 5722 1964 5845 1965 6052 1966 5584 1967 5905 1968 6401 1969 6815 1970 7280 1971 6473 1972 7606 1973 7628 1974 7857 1975 8163 1976 8442 1977 8929 1978 9771 1979 10330 1980 10200 1981 10190 1982 10510 1983 10720 1984 10970 1985 11050 1986 10740 1987 10390 1988 9895 1989 10120 1990 10110 1991 9748 1992 9693 1993 9279 1994 9006 1995 9168 1996 9375 1997 9322 1998 9646 1999 9810 2000 9885 2001 10200 2002 10630 2003 11250 2004 11570 2005 12080 2006 12090 2007 12290 2008 12310 2009 12290 2010 12490 2011 12610 2012 12750 2013 12960 2014 13240 2015 13520 2016 13840 2017 14180 2018 14550 2019 14940