Year	Measure
1800	528.7
1801	528.7
1802	528.7
1803	528.7
1804	528.7
1805	528.7
1806	528.7
1807	528.7
1808	528.7
1809	528.7
1810	528.7
1811	528.7
1812	528.7
1813	528.7
1814	528.7
1815	528.7
1816	528.7
1817	528.7
1818	528.7
1819	528.7
1820	528.7
1821	530.2
1822	531.8
1823	533.4
1824	534.9
1825	536.5
1826	538
1827	539.6
1828	541.2
1829	542.8
1830	544.4
1831	546
1832	547.6
1833	549.2
1834	550.8
1835	552.4
1836	554
1837	555.6
1838	557.2
1839	558.9
1840	560.5
1841	562.1
1842	563.8
1843	565.4
1844	567.1
1845	568.8
1846	570.4
1847	572.1
1848	573.8
1849	575.4
1850	577.1
1851	578.8
1852	580.5
1853	582.2
1854	583.9
1855	585.6
1856	587.3
1857	589
1858	590.8
1859	592.5
1860	594.2
1861	596
1862	597.7
1863	599.5
1864	601.2
1865	603
1866	604.7
1867	606.5
1868	608.3
1869	610.1
1870	611.8
1871	613.6
1872	615.4
1873	617.2
1874	619
1875	620.8
1876	622.7
1877	624.5
1878	626.3
1879	628.1
1880	630
1881	631.8
1882	633.7
1883	635.5
1884	637.4
1885	639.2
1886	612.8
1887	714.5
1888	685.4
1889	635.5
1890	631.1
1891	576.4
1892	629.3
1893	711.1
1894	806.2
1895	743.9
1896	817
1897	801.1
1898	820
1899	867.7
1900	846.7
1901	865.3
1902	937.6
1903	870.5
1904	959.9
1905	847.2
1906	807.4
1907	773.7
1908	842.5
1909	872.2
1910	928.1
1911	855
1912	921.2
1913	965
1914	918.9
1915	943
1916	936.6
1917	809.3
1918	699.3
1919	604.2
1920	569.2
1921	536.3
1922	577.1
1923	621
1924	668.2
1925	719
1926	773.8
1927	832.6
1928	896
1929	903.8
1930	941.9
1931	947.8
1932	930.5
1933	962.8
1934	1048
1935	1195
1936	1273
1937	1374
1938	1367
1939	1418
1940	1355
1941	1326
1942	1297
1943	1269
1944	1242
1945	1215
1946	1189
1947	1317
1948	1484
1949	1616
1950	1746
1951	1719
1952	1794
1953	1835
1954	1887
1955	2007
1956	2154
1957	2154
1958	2269
1959	2198
1960	2356
1961	2447
1962	2473
1963	2380
1964	2651
1965	2767
1966	2869
1967	2964
1968	3107
1969	3121
1970	3330
1971	3385
1972	3370
1973	3619
1974	3621
1975	3531
1976	3596
1977	3581
1978	3573
1979	3461
1980	3375
1981	3316
1982	3308
1983	3322
1984	3272
1985	3213
1986	3255
1987	3209
1988	3191
1989	3164
1990	3011
1991	2923
1992	2542
1993	2434
1994	2265
1995	2207
1996	2208
1997	2286
1998	2349
1999	2413
2000	2470
2001	2540
2002	2605
2003	2675
2004	2835
2005	2983
2006	3165
2007	3414
2008	3669
2009	3903
2010	4160
2011	4412
2012	4671
2013	4962
2014	5246
2015	5521
2016	5783
2017	6028
2018	6285
2019	6552