Year	Measure
1800	540.7
1801	540.7
1802	540.7
1803	540.7
1804	540.7
1805	540.7
1806	540.7
1807	540.7
1808	540.7
1809	540.7
1810	540.7
1811	540.7
1812	540.7
1813	540.7
1814	540.7
1815	540.7
1816	540.7
1817	540.7
1818	540.7
1819	540.7
1820	540.7
1821	542.7
1822	544.7
1823	546.8
1824	548.8
1825	550.8
1826	552.9
1827	554.9
1828	557
1829	559
1830	561.1
1831	563.2
1832	565.3
1833	567.4
1834	569.5
1835	571.6
1836	573.7
1837	575.8
1838	578
1839	580.1
1840	582.2
1841	584.4
1842	586.6
1843	588.7
1844	590.9
1845	593.1
1846	595.3
1847	597.5
1848	599.7
1849	602
1850	604.2
1851	606.4
1852	608.7
1853	610.9
1854	613.2
1855	615.5
1856	617.8
1857	620
1858	622.3
1859	624.7
1860	627
1861	629.3
1862	631.6
1863	634
1864	636.3
1865	638.7
1866	641
1867	643.4
1868	645.8
1869	648.2
1870	650.6
1871	653
1872	655.4
1873	657.9
1874	660.3
1875	662.8
1876	665.2
1877	667.7
1878	670.1
1879	672.6
1880	675.1
1881	677.6
1882	680.1
1883	682.7
1884	685.2
1885	687.7
1886	659.7
1887	769.6
1888	738.7
1889	685.3
1890	681
1891	622.4
1892	679.8
1893	768.7
1894	872
1895	805.1
1896	884.8
1897	868
1898	889.1
1899	941.3
1900	919
1901	939.9
1902	1019
1903	946.6
1904	1044
1905	922.4
1906	879.6
1907	843.3
1908	918.9
1909	951.9
1910	1013
1911	934.2
1912	1007
1913	1056
1914	1006
1915	1033
1916	1000
1917	833.5
1918	694.5
1919	578.7
1920	549.4
1921	521.6
1922	565.6
1923	613.5
1924	665.3
1925	721.5
1926	782.5
1927	848.7
1928	920.4
1929	998.2
1930	1041
1931	1048
1932	1030
1933	1066
1934	1161
1935	1325
1936	1411
1937	1525
1938	1517
1939	1575
1940	1506
1941	1475
1942	1444
1943	1414
1944	1384
1945	1355
1946	1327
1947	1471
1948	1658
1949	1807
1950	1952
1951	1924
1952	2009
1953	2056
1954	2115
1955	2251
1956	2418
1957	2419
1958	2549
1959	2471
1960	2651
1961	2753
1962	2782
1963	2678
1964	2982
1965	3113
1966	3228
1967	3335
1968	3495
1969	3511
1970	3746
1971	3808
1972	3791
1973	4071
1974	4115
1975	4053
1976	4169
1977	4193
1978	4225
1979	4134
1980	4071
1981	4040
1982	4071
1983	4130
1984	4109
1985	4074
1986	4169
1987	4151
1988	4170
1989	4176
1990	4014
1991	3482
1992	2062
1993	1966
1994	2142
1995	2332
1996	2474
1997	2560
1998	2755
1999	2848
2000	3021
2001	3327
2002	3847
2003	4400
2004	4878
2005	5577
2006	6306
2007	7161
2008	7641
2009	6494
2010	6572
2011	6812
2012	7284
2013	7501
2014	7805
2015	8140
2016	8505
2017	8913
2018	9340
2019	9787