Year Measure 1764 2495 1765 2492 1766 2490 1767 2488 1768 2485 1769 2483 1770 2481 1771 2479 1772 2476 1773 2474 1774 2472 1775 2469 1776 2467 1777 2465 1778 2462 1779 2460 1780 2458 1781 2456 1782 2453 1783 2451 1784 2449 1785 2446 1786 2444 1787 2442 1788 2440 1789 2437 1790 2435 1791 2433 1792 2430 1793 2428 1794 2426 1795 2424 1796 2421 1797 2419 1798 2417 1799 2415 1800 2412 1801 2410 1802 2408 1803 2406 1804 2403 1805 2401 1806 2399 1807 2397 1808 2140 1809 2115 1810 2431 1811 2464 1812 2149 1813 1938 1814 1873 1815 2485 1816 2370 1817 2397 1818 2440 1819 2330 1820 2501 1821 2447 1822 2466 1823 2584 1824 2562 1825 2492 1826 2528 1827 2673 1828 2726 1829 2726 1830 2484 1831 2666 1832 2786 1833 2719 1834 2739 1835 2726 1836 2812 1837 2874 1838 2900 1839 2894 1840 2917 1841 2941 1842 2864 1843 2809 1844 2830 1845 2805 1846 2805 1847 2819 1848 2861 1849 2941 1850 2992 1851 3030 1852 2990 1853 2918 1854 3092 1855 3002 1856 3118 1857 3058 1858 2969 1859 2858 1860 2990 1861 2903 1862 3013 1863 3064 1864 3182 1865 3182 1866 3296 1867 3178 1868 3192 1869 3291 1870 3390 1871 3358 1872 3384 1873 3443 1874 3303 1875 3482 1876 3479 1877 3509 1878 3487 1879 3306 1880 3485 1881 3494 1882 3531 1883 3740 1884 3752 1885 3778 1886 3779 1887 3816 1888 3809 1889 3884 1890 3673 1891 3628 1892 3686 1893 3593 1894 3746 1895 3708 1896 3801 1897 3833 1898 3827 1899 3818 1900 3713 1901 3827 1902 3918 1903 3844 1904 3829 1905 3952 1906 3963 1907 3826 1908 3839 1909 3980 1910 4088 1911 4189 1912 4263 1913 4422 1914 4315 1915 4099 1916 4042 1917 3589 1918 3332 1919 3717 1920 4231 1921 4959 1922 5218 1923 5262 1924 5564 1925 5682 1926 6000 1927 6212 1928 6408 1929 6458 1930 6309 1931 6009 1932 5868 1933 5828 1934 5714 1935 5823 1936 6106 1937 6414 1938 6177 1939 6642 1940 5796 1941 5450 1942 4950 1943 4813 1944 3202 1945 3255 1946 5458 1947 6216 1948 6793 1949 7196 1950 7408 1951 7499 1952 7564 1953 8144 1954 8639 1955 9171 1956 9495 1957 9691 1958 9483 1959 9823 1960 10620 1961 10820 1962 11170 1963 11420 1964 12290 1965 12810 1966 13040 1967 13630 1968 14440 1969 15300 1970 16040 1971 16600 1972 16940 1973 17680 1974 18320 1975 18260 1976 18990 1977 19420 1978 19840 1979 20130 1980 20370 1981 20190 1982 19900 1983 20250 1984 20860 1985 21390 1986 22010 1987 22350 1988 23030 1989 23980 1990 24900 1991 25380 1992 25710 1993 25960 1994 26650 1995 27420 1996 28340 1997 29490 1998 30570 1999 31900 2000 33000 2001 33480 2002 33410 2003 33450 2004 34180 2005 34720 2006 35850 2007 37170 2008 37690 2009 36130 2010 36530 2011 36720 2012 36260 2013 35920 2014 36220 2015 36720 2016 37280 2017 37910 2018 38600