Year	Measure
1820	418.1
1821	420.1
1822	422
1823	424
1824	426
1825	428
1826	430
1827	432
1828	434.1
1829	436.1
1830	438.1
1831	440.2
1832	442.3
1833	444.3
1834	446.4
1835	448.5
1836	450.6
1837	452.7
1838	454.8
1839	457
1840	459.1
1841	461.3
1842	463.4
1843	465.6
1844	467.8
1845	470
1846	472.2
1847	474.4
1848	476.6
1849	478.9
1850	481.1
1851	483.4
1852	485.6
1853	487.9
1854	490.2
1855	492.5
1856	494.8
1857	497.1
1858	499.5
1859	501.8
1860	504.1
1861	506.5
1862	508.9
1863	511.3
1864	513.7
1865	516.1
1866	518.5
1867	520.9
1868	523.4
1869	525.8
1870	528.3
1871	530.8
1872	533.3
1873	535.8
1874	538.3
1875	540.8
1876	543.3
1877	545.9
1878	548.4
1879	551
1880	553.6
1881	556.2
1882	558.8
1883	561.4
1884	564.1
1885	566.7
1886	569.4
1887	572
1888	574.7
1889	577.4
1890	580.1
1891	582.8
1892	585.6
1893	588.3
1894	591.1
1895	593.8
1896	596.6
1897	599.4
1898	602.2
1899	605.1
1900	607.9
1901	610.7
1902	613.6
1903	616.5
1904	619.4
1905	622.3
1906	625.2
1907	628.1
1908	631.1
1909	634
1910	637
1911	640
1912	643
1913	646
1914	650.8
1915	655.5
1916	660.4
1917	665.2
1918	670.1
1919	675
1920	680
1921	685
1922	690
1923	695.1
1924	700.2
1925	705.3
1926	710.5
1927	715.7
1928	721
1929	726.3
1930	731.6
1931	737
1932	742.4
1933	747.9
1934	753.4
1935	758.9
1936	764.5
1937	770.1
1938	775.8
1939	781.5
1940	787.2
1941	793
1942	798.8
1943	804.7
1944	810.6
1945	816.6
1946	822.6
1947	828.6
1948	834.7
1949	840.9
1950	847
1951	863.1
1952	873.7
1953	888.7
1954	903.7
1955	917.2
1956	929.8
1957	942.5
1958	953.6
1959	969.1
1960	978.4
1961	997.1
1962	1010
1963	1026
1964	1046
1965	1062
1966	1149
1967	1247
1968	1354
1969	1462
1970	1573
1971	1816
1972	2323
1973	2729
1974	3159
1975	2974
1976	3358
1977	3300
1978	3736
1979	3919
1980	4289
1981	4515
1982	4671
1983	5214
1984	5594
1985	5805
1986	6045
1987	6370
1988	7143
1989	7821
1990	8036
1991	8175
1992	8164
1993	8068
1994	8106
1995	8242
1996	8500
1997	8875
1998	9228
1999	9665
2000	10370
2001	10820
2002	11290
2003	11690
2004	12030
2005	12380
2006	12910
2007	13350
2008	13590
2009	12790
2010	13530
2011	14050
2012	14470
2013	14860
2014	15290
2015	15770
2016	16220
2017	16680
2018	17140
2019	17580