Year	Measure
1820	504.8
1821	505.3
1822	505.8
1823	506.3
1824	506.8
1825	507.3
1826	507.8
1827	508.3
1828	508.8
1829	509.3
1830	509.8
1831	510.3
1832	510.8
1833	511.3
1834	511.8
1835	512.3
1836	512.8
1837	513.3
1838	513.8
1839	514.3
1840	514.8
1841	515.3
1842	515.8
1843	516.3
1844	516.8
1845	517.3
1846	517.8
1847	518.3
1848	518.8
1849	519.3
1850	519.8
1851	520.3
1852	520.8
1853	521.4
1854	521.9
1855	522.4
1856	522.9
1857	523.4
1858	523.9
1859	524.4
1860	524.9
1861	525.4
1862	525.9
1863	526.5
1864	527
1865	527.5
1866	528
1867	528.5
1868	529
1869	529.5
1870	530.1
1871	530.6
1872	531.1
1873	531.6
1874	532.1
1875	532.7
1876	533.2
1877	533.7
1878	534.2
1879	534.7
1880	535.3
1881	535.8
1882	536.3
1883	536.8
1884	537.3
1885	537.9
1886	538.4
1887	538.9
1888	539.4
1889	540
1890	540.5
1891	541
1892	541.6
1893	542.1
1894	542.6
1895	543.1
1896	543.7
1897	544.2
1898	544.7
1899	545.3
1900	545.8
1901	546.3
1902	546.9
1903	547.4
1904	547.9
1905	548.5
1906	549
1907	549.5
1908	550.1
1909	550.6
1910	551.1
1911	551.7
1912	552.2
1913	552.7
1914	553.3
1915	553.8
1916	554.4
1917	554.9
1918	555.4
1919	556
1920	556.5
1921	557.1
1922	557.6
1923	558.2
1924	558.7
1925	559.3
1926	559.8
1927	560.3
1928	560.9
1929	561.4
1930	562
1931	562.5
1932	563.1
1933	563.6
1934	564.2
1935	564.7
1936	565.3
1937	565.8
1938	566.4
1939	566.9
1940	567.5
1941	568
1942	568.6
1943	569.2
1944	569.7
1945	570.3
1946	570.8
1947	571.4
1948	571.9
1949	572.5
1950	573
1951	588.5
1952	603.7
1953	618.9
1954	634.9
1955	651.6
1956	668.9
1957	685.8
1958	704.4
1959	721.9
1960	735.5
1961	760.9
1962	802.8
1963	787.4
1964	799.6
1965	823.4
1966	819.9
1967	883.2
1968	900.9
1969	908.3
1970	899.8
1971	924.4
1972	949.8
1973	887.4
1974	858.2
1975	808.9
1976	788.3
1977	826
1978	901.8
1979	889.9
1980	883.1
1981	899.8
1982	896.9
1983	864.6
1984	856.2
1985	943.2
1986	1062
1987	1013
1988	1064
1989	1019
1990	978
1991	1042
1992	1035
1993	995.5
1994	976.7
1995	988.9
1996	1033
1997	1052
1998	1087
1999	1122
2000	1113
2001	1144
2002	1153
2003	1201
2004	1219
2005	1267
2006	1307
2007	1321
2008	1357
2009	1356
2010	1420
2011	1435
2012	1517
2013	1591
2014	1648
2015	1724
2016	1804
2017	1888
2018	1966
2019	2059