Year	Measure
1820	473.9
1821	474.8
1822	475.7
1823	476.6
1824	477.5
1825	478.4
1826	479.3
1827	480.2
1828	481.1
1829	482
1830	482.9
1831	483.8
1832	484.8
1833	485.7
1834	486.6
1835	487.5
1836	488.5
1837	489.4
1838	490.3
1839	491.2
1840	492.2
1841	493.1
1842	494
1843	495
1844	495.9
1845	496.9
1846	497.8
1847	498.7
1848	499.7
1849	500.6
1850	501.6
1851	502.5
1852	503.5
1853	504.4
1854	505.4
1855	506.4
1856	507.3
1857	508.3
1858	509.3
1859	510.2
1860	511.2
1861	512.2
1862	513.1
1863	514.1
1864	515.1
1865	516.1
1866	517
1867	518
1868	519
1869	520
1870	521
1871	522
1872	522.9
1873	523.9
1874	524.9
1875	525.9
1876	526.9
1877	527.9
1878	528.9
1879	529.9
1880	530.9
1881	531.9
1882	533
1883	534
1884	535
1885	536
1886	537
1887	538
1888	539
1889	540.1
1890	541.1
1891	542.1
1892	543.1
1893	544.2
1894	545.2
1895	546.2
1896	547.3
1897	548.3
1898	549.4
1899	550.4
1900	551.4
1901	552.5
1902	553.5
1903	554.6
1904	555.6
1905	556.7
1906	557.8
1907	558.8
1908	559.9
1909	560.9
1910	562
1911	563.1
1912	564.1
1913	565.2
1914	566.3
1915	567.4
1916	568.4
1917	569.5
1918	570.6
1919	571.7
1920	572.8
1921	573.8
1922	574.9
1923	576
1924	577.1
1925	578.2
1926	579.3
1927	580.4
1928	581.5
1929	582.6
1930	583.7
1931	584.8
1932	585.9
1933	587
1934	588.2
1935	589.3
1936	590.4
1937	591.5
1938	592.6
1939	593.8
1940	594.9
1941	596
1942	597.1
1943	598.3
1944	599.4
1945	600.5
1946	601.7
1947	602.8
1948	604
1949	605.1
1950	606.3
1951	633.1
1952	643.1
1953	656.7
1954	685.1
1955	697.4
1956	712.7
1957	726.3
1958	735.8
1959	764.9
1960	783.2
1961	820.1
1962	865.1
1963	803.7
1964	840.2
1965	881.1
1966	883
1967	893.3
1968	902.8
1969	911.5
1970	924.8
1971	934.6
1972	934.8
1973	956.3
1974	1003
1975	1024
1976	1101
1977	1102
1978	1108
1979	1087
1980	1101
1981	1084
1982	1080
1983	1070
1984	1050
1985	1018
1986	1010
1987	1015
1988	1049
1989	1063
1990	1052
1991	1005
1992	1001
1993	1020
1994	1028
1995	1040
1996	1057
1997	1096
1998	1131
1999	1147
2000	1143
2001	1178
2002	1192
2003	1178
2004	1182
2005	1192
2006	1197
2007	1193
2008	1224
2009	1191
2010	1184
2011	1200
2012	1216
2013	1216
2014	1240
2015	1270
2016	1302
2017	1337
2018	1532
2019	1758