Year	Measure
1820	523.3
1821	525.7
1822	528.2
1823	530.7
1824	533.2
1825	535.7
1826	538.2
1827	540.7
1828	543.2
1829	545.8
1830	548.3
1831	550.9
1832	553.5
1833	556.1
1834	558.7
1835	561.3
1836	563.9
1837	566.6
1838	569.2
1839	571.9
1840	574.6
1841	577.3
1842	580
1843	582.7
1844	585.4
1845	588.2
1846	590.9
1847	593.7
1848	596.5
1849	599.3
1850	602.1
1851	604.9
1852	607.8
1853	610.6
1854	613.5
1855	616.4
1856	619.2
1857	622.2
1858	625.1
1859	628
1860	630.9
1861	633.9
1862	636.9
1863	639.9
1864	642.9
1865	645.9
1866	648.9
1867	651.9
1868	655
1869	658.1
1870	661.2
1871	664.3
1872	667.4
1873	670.5
1874	673.7
1875	676.8
1876	680
1877	683.2
1878	686.4
1879	689.6
1880	692.8
1881	696.1
1882	699.3
1883	702.6
1884	705.9
1885	709.2
1886	712.5
1887	715.9
1888	719.2
1889	722.6
1890	726
1891	729.4
1892	732.8
1893	736.3
1894	739.7
1895	743.2
1896	746.7
1897	750.2
1898	753.7
1899	757.2
1900	760.8
1901	764.3
1902	767.9
1903	771.5
1904	775.1
1905	778.8
1906	782.4
1907	786.1
1908	789.8
1909	793.5
1910	797.2
1911	801
1912	804.7
1913	808.5
1914	825.4
1915	842.7
1916	860.4
1917	878.5
1918	896.9
1919	915.7
1920	934.9
1921	954.5
1922	974.5
1923	995
1924	1016
1925	1037
1926	1059
1927	1081
1928	1104
1929	1127
1930	1151
1931	1175
1932	1199
1933	1224
1934	1250
1935	1276
1936	1303
1937	1330
1938	1358
1939	1387
1940	1416
1941	1446
1942	1476
1943	1507
1944	1538
1945	1571
1946	1604
1947	1637
1948	1672
1949	1707
1950	1742
1951	1774
1952	1804
1953	1833
1954	1863
1955	1893
1956	1921
1957	1950
1958	1978
1959	2004
1960	2000
1961	2041
1962	2058
1963	2086
1964	2075
1965	2091
1966	2087
1967	2005
1968	2075
1969	1885
1970	1986
1971	1924
1972	1987
1973	1820
1974	1840
1975	1932
1976	2059
1977	1942
1978	1809
1979	1876
1980	1759
1981	1692
1982	1889
1983	1877
1984	1736
1985	1747
1986	1776
1987	1793
1988	1829
1989	1744
1990	1770
1991	1712
1992	1701
1993	1619
1994	1620
1995	1658
1996	1695
1997	1732
1998	1782
1999	1824
2000	1880
2001	1918
2002	1890
2003	1965
2004	2028
2005	2084
2006	2078
2007	2124
2008	2143
2009	2132
2010	2165
2011	2163
2012	2174
2013	2198
2014	2233
2015	2273
2016	2322
2017	2371
2018	2422
2019	2474