Year	Measure
1800	818
1801	818
1802	818
1803	818
1804	818
1805	818
1806	818
1807	818
1808	818
1809	818
1810	818
1811	818
1812	818
1813	818
1814	818
1815	818
1816	818
1817	818
1818	818
1819	818
1820	818
1821	818.6
1822	819.1
1823	819.6
1824	820.2
1825	820.7
1826	821.3
1827	821.8
1828	822.4
1829	822.9
1830	823.4
1831	824
1832	824.5
1833	825.1
1834	825.6
1835	826.2
1836	826.7
1837	827.3
1838	827.8
1839	828.4
1840	828.9
1841	829.5
1842	830
1843	830.6
1844	831.1
1845	831.6
1846	832.2
1847	832.7
1848	833.3
1849	833.9
1850	834.4
1851	835
1852	835.5
1853	836.1
1854	836.6
1855	837.2
1856	837.7
1857	838.3
1858	838.8
1859	839.4
1860	839.9
1861	840.5
1862	841
1863	841.6
1864	842.2
1865	842.7
1866	843.3
1867	843.8
1868	844.4
1869	844.9
1870	845.5
1871	846.1
1872	846.6
1873	847.2
1874	847.7
1875	848.3
1876	848.9
1877	849.4
1878	850
1879	850.5
1880	851.1
1881	851.7
1882	852.2
1883	852.8
1884	853.4
1885	853.9
1886	854.5
1887	855.1
1888	855.6
1889	856.2
1890	856.8
1891	857.3
1892	857.9
1893	858.5
1894	859
1895	859.6
1896	860.2
1897	860.7
1898	861.3
1899	861.9
1900	862.4
1901	863
1902	863.6
1903	864.1
1904	864.7
1905	865.3
1906	865.9
1907	866.4
1908	867
1909	867.6
1910	868.2
1911	868.7
1912	869.3
1913	869.9
1914	870.4
1915	871
1916	871.6
1917	872.2
1918	872.8
1919	873.3
1920	873.9
1921	874.5
1922	875.1
1923	875.6
1924	876.2
1925	876.8
1926	877.4
1927	878
1928	878.5
1929	879.1
1930	879.7
1931	880.3
1932	880.9
1933	881.4
1934	882
1935	882.6
1936	883.2
1937	883.8
1938	884.4
1939	884.9
1940	885.5
1941	886.1
1942	886.7
1943	887.3
1944	887.9
1945	888.5
1946	889.1
1947	889.6
1948	890.2
1949	890.8
1950	891.4
1951	926.7
1952	962.4
1953	1001
1954	1175
1955	1102
1956	1225
1957	1274
1958	1282
1959	1267
1960	1305
1961	1363
1962	1416
1963	1444
1964	1563
1965	1641
1966	1715
1967	1785
1968	1809
1969	1865
1970	1919
1971	1835
1972	1945
1973	1942
1974	2009
1975	2037
1976	1986
1977	1813
1978	2016
1979	2021
1980	1661
1981	1918
1982	1987
1983	1784
1984	1815
1985	1871
1986	1814
1987	1746
1988	1773
1989	1741
1990	1755
1991	1801
1992	1768
1993	1749
1994	1754
1995	1788
1996	1832
1997	1889
1998	1326
1999	1401
2000	1499
2001	1469
2002	1365
2003	1330
2004	1333
2005	1349
2006	1351
2007	1366
2008	1381
2009	1393
2010	1412
2011	1457
2012	1406
2013	1381
2014	1393
2015	1417
2016	1444
2017	1473
2018	1502
2019	1534