Year	Measure
1800	440
1801	440.3
1802	440.7
1803	441
1804	441.4
1805	441.7
1806	442.1
1807	442.4
1808	442.7
1809	443.1
1810	443.4
1811	443.8
1812	444.1
1813	444.5
1814	444.8
1815	445.2
1816	445.5
1817	445.9
1818	446.2
1819	446.5
1820	446.9
1821	447.2
1822	447.6
1823	447.9
1824	448.3
1825	448.6
1826	449
1827	449.3
1828	449.7
1829	450
1830	450.4
1831	450.7
1832	451.1
1833	451.4
1834	451.8
1835	452.1
1836	452.5
1837	452.8
1838	453.2
1839	453.5
1840	453.9
1841	454.3
1842	454.6
1843	455
1844	455.3
1845	455.7
1846	456
1847	456.4
1848	456.7
1849	457.1
1850	457.4
1851	457.8
1852	458.2
1853	458.5
1854	458.9
1855	459.2
1856	459.6
1857	459.9
1858	460.3
1859	460.7
1860	461
1861	461.4
1862	461.7
1863	462.1
1864	462.4
1865	462.8
1866	463.2
1867	463.5
1868	463.9
1869	464.2
1870	464.6
1871	465
1872	465.3
1873	465.7
1874	466.1
1875	466.4
1876	466.8
1877	467.1
1878	467.5
1879	467.9
1880	468.2
1881	468.6
1882	469
1883	469.3
1884	469.7
1885	470.1
1886	470.4
1887	470.8
1888	471.2
1889	471.5
1890	471.9
1891	472.3
1892	472.6
1893	473
1894	473.4
1895	473.7
1896	474.1
1897	474.5
1898	474.8
1899	475.2
1900	475.6
1901	475.9
1902	476.3
1903	476.7
1904	477.1
1905	477.4
1906	477.8
1907	478.2
1908	478.5
1909	478.9
1910	479.3
1911	479.7
1912	480
1913	480.4
1914	480.8
1915	481.2
1916	481.5
1917	481.9
1918	482.3
1919	482.7
1920	483
1921	483.4
1922	483.8
1923	484.2
1924	484.5
1925	484.9
1926	485.3
1927	485.7
1928	486
1929	486.4
1930	486.8
1931	487.2
1932	487.6
1933	487.9
1934	488.3
1935	488.7
1936	489.1
1937	489.5
1938	489.8
1939	490.2
1940	490.6
1941	491
1942	491.4
1943	491.7
1944	492.1
1945	492.5
1946	492.9
1947	493.3
1948	493.7
1949	494
1950	494.4
1951	513.7
1952	520.6
1953	532.3
1954	551.8
1955	559.5
1956	570.8
1957	582.4
1958	588.2
1959	611.2
1960	609.1
1961	511.4
1962	545
1963	558.7
1964	577.1
1965	583.2
1966	594.5
1967	633.7
1968	613.8
1969	595.5
1970	741.6
1971	783.3
1972	712.1
1973	761.2
1974	743.4
1975	734.3
1976	776.7
1977	853.3
1978	823.3
1979	801
1980	828.3
1981	881.5
1982	858.6
1983	864.3
1984	843.4
1985	922
1986	938.9
1987	954.1
1988	964.5
1989	956.3
1990	967.3
1991	992
1992	969.3
1993	940.6
1994	897.9
1995	778.2
1996	710.2
1997	710.6
1998	726.8
1999	698.8
2000	680.9
2001	675.9
2002	685
2003	655.4
2004	662.5
2005	644.6
2006	666
2007	684.1
2008	701.8
2009	709.2
2010	718.8
2011	731.3
2012	742.9
2013	757.9
2014	775.2
2015	793.4
2016	813.5
2017	835.7
2018	860.2
2019	885