Year	Measure
1800	886.8
1801	886.8
1802	886.8
1803	886.8
1804	886.8
1805	886.8
1806	886.8
1807	886.8
1808	886.8
1809	886.8
1810	886.8
1811	886.8
1812	886.8
1813	886.8
1814	886.8
1815	886.8
1816	886.8
1817	886.8
1818	886.8
1819	886.8
1820	886.8
1821	886.6
1822	886.4
1823	886.2
1824	885.9
1825	885.7
1826	885.5
1827	885.3
1828	885.1
1829	884.8
1830	884.6
1831	884.4
1832	884.2
1833	884
1834	883.7
1835	883.5
1836	883.3
1837	883.1
1838	882.9
1839	882.6
1840	882.4
1841	882.2
1842	882
1843	881.8
1844	881.5
1845	881.3
1846	881.1
1847	880.9
1848	880.7
1849	880.4
1850	880.2
1851	880
1852	879.8
1853	879.6
1854	879.3
1855	879.1
1856	878.9
1857	878.7
1858	878.5
1859	878.2
1860	878
1861	877.8
1862	877.6
1863	877.4
1864	877.1
1865	876.9
1866	876.7
1867	876.5
1868	876.3
1869	876
1870	875.8
1871	875.6
1872	875.4
1873	875.2
1874	875
1875	874.7
1876	874.5
1877	874.3
1878	874.1
1879	873.9
1880	873.6
1881	873.4
1882	873.2
1883	873
1884	872.8
1885	872.6
1886	872.3
1887	872.1
1888	871.9
1889	871.7
1890	871.5
1891	871.2
1892	871
1893	870.8
1894	870.6
1895	870.4
1896	870.2
1897	869.9
1898	869.7
1899	869.5
1900	869.3
1901	869.1
1902	868.9
1903	868.6
1904	868.4
1905	868.2
1906	868
1907	867.8
1908	867.6
1909	867.3
1910	867.1
1911	866.9
1912	866.7
1913	866.5
1914	866.3
1915	866
1916	865.8
1917	865.6
1918	865.4
1919	865.2
1920	865
1921	864.7
1922	864.5
1923	864.3
1924	864.1
1925	863.9
1926	863.7
1927	863.5
1928	863.2
1929	863
1930	862.8
1931	862.6
1932	862.4
1933	862.2
1934	861.9
1935	861.7
1936	861.5
1937	861.3
1938	861.1
1939	860.9
1940	860.7
1941	860.4
1942	860.2
1943	860
1944	859.8
1945	859.6
1946	859.4
1947	859.2
1948	858.9
1949	858.7
1950	858.5
1951	877
1952	895.9
1953	915.1
1954	934.8
1955	955
1956	975.5
1957	996.5
1958	1018
1959	1040
1960	1062
1961	1085
1962	1108
1963	1132
1964	1157
1965	1182
1966	1207
1967	1233
1968	1260
1969	1287
1970	1314
1971	1351
1972	1351
1973	1339
1974	1381
1975	1238
1976	1212
1977	1311
1978	1462
1979	1572
1980	1810
1981	1965
1982	1851
1983	2089
1984	2573
1985	2818
1986	2984
1987	3145
1988	3309
1989	3501
1990	3944
1991	4119
1992	4249
1993	4385
1994	4554
1995	4759
1996	5065
1997	5533
1998	5935
1999	6284
2000	6450
2001	6552
2002	6845
2003	7363
2004	8071
2005	7546
2006	8866
2007	9612
2008	10620
2009	10070
2010	10600
2011	11160
2012	11070
2013	11290
2014	11570
2015	11890
2016	12240
2017	12600
2018	12980
2019	13370