Year Measure 1800 1086 1801 1086 1802 1086 1803 1086 1804 1086 1805 1086 1806 1086 1807 1086 1808 1086 1809 1086 1810 1086 1811 1086 1812 1086 1813 1086 1814 1086 1815 1086 1816 1086 1817 1086 1818 1086 1819 1086 1820 1086 1821 1112 1822 1138 1823 1165 1824 1192 1825 1221 1826 1249 1827 1279 1828 1309 1829 1340 1830 1371 1831 1404 1832 1437 1833 1471 1834 1505 1835 1541 1836 1577 1837 1614 1838 1652 1839 1691 1840 1731 1841 1772 1842 1814 1843 1857 1844 1900 1845 1945 1846 1991 1847 2038 1848 2086 1849 2135 1850 2186 1851 2237 1852 2290 1853 2344 1854 2399 1855 2456 1856 2514 1857 2573 1858 2633 1859 2696 1860 2759 1861 2824 1862 2891 1863 2959 1864 3029 1865 3100 1866 3173 1867 3248 1868 3324 1869 3403 1870 3483 1871 3479 1872 4204 1873 4154 1874 3698 1875 3102 1876 3362 1877 3390 1878 3589 1879 3113 1880 3325 1881 3085 1882 3322 1883 3828 1884 3712 1885 4103 1886 4166 1887 3621 1888 4341 1889 3857 1890 3430 1891 3658 1892 3665 1893 3893 1894 4244 1895 4102 1896 4223 1897 3983 1898 3594 1899 3611 1900 3544 1901 3567 1902 4109 1903 4177 1904 4216 1905 3728 1906 4046 1907 4404 1908 4749 1909 4722 1910 5009 1911 4723 1912 5603 1913 5287 1914 4239 1915 3946 1916 4006 1917 4340 1918 4516 1919 5007 1920 4271 1921 4394 1922 4916 1923 5063 1924 5426 1925 5091 1926 5427 1927 6065 1928 6238 1929 6145 1930 6870 1931 5591 1932 5105 1933 4393 1934 5144 1935 5360 1936 5525 1937 5530 1938 5872 1939 5897 1940 5847 1941 5882 1942 5331 1943 5320 1944 5917 1945 6011 1946 6521 1947 6888 1948 7036 1949 7193 1950 7442 1951 7914 1952 7917 1953 8207 1954 8610 1955 8548 1956 8561 1957 8518 1958 8629 1959 7762 1960 7922 1961 8044 1962 7760 1963 7698 1964 7759 1965 7762 1966 7945 1967 7540 1968 7582 1969 7972 1970 8280 1971 8194 1972 7898 1973 7945 1974 8183 1975 8659 1976 8958 1977 9007 1978 9429 1979 9957 1980 10510 1981 10650 1982 9583 1983 8967 1984 8816 1985 8891 1986 9620 1987 10320 1988 10260 1989 10320 1990 10340 1991 10560 1992 11270 1993 11540 1994 12090 1995 11760 1996 12270 1997 12780 1998 13280 1999 12830 2000 12590 2001 12090 2002 10700 2003 10880 2004 12100 2005 12830 2006 13320 2007 14150 2008 15120 2009 15440 2010 16750 2011 17640 2012 18270 2013 18980 2014 19440 2015 19950 2016 20540 2017 21210 2018 21940 2019 22700