Year	Measure
1820	634.3
1821	634.4
1822	634.6
1823	634.7
1824	634.8
1825	634.9
1826	635
1827	635.1
1828	635.3
1829	635.4
1830	635.5
1831	635.6
1832	635.7
1833	635.9
1834	636
1835	636.1
1836	636.2
1837	636.3
1838	636.5
1839	636.6
1840	636.7
1841	636.8
1842	636.9
1843	637
1844	637.2
1845	637.3
1846	637.4
1847	637.5
1848	637.6
1849	637.8
1850	637.9
1851	638
1852	638.1
1853	638.2
1854	638.4
1855	638.5
1856	638.6
1857	638.7
1858	638.8
1859	639
1860	639.1
1861	639.2
1862	639.3
1863	639.4
1864	639.6
1865	639.7
1866	639.8
1867	639.9
1868	640
1869	640.2
1870	640.3
1871	640.4
1872	640.5
1873	640.6
1874	640.8
1875	640.9
1876	641
1877	641.1
1878	641.2
1879	641.4
1880	641.5
1881	641.6
1882	641.7
1883	641.8
1884	642
1885	642.1
1886	642.2
1887	642.3
1888	642.4
1889	642.6
1890	642.7
1891	642.8
1892	642.9
1893	643
1894	643.2
1895	643.3
1896	643.4
1897	643.5
1898	643.6
1899	643.8
1900	643.9
1901	644
1902	644.1
1903	644.2
1904	644.4
1905	644.5
1906	644.6
1907	644.7
1908	644.8
1909	645
1910	645.1
1911	645.2
1912	645.3
1913	645.4
1914	645.6
1915	645.7
1916	645.8
1917	645.9
1918	646
1919	646.2
1920	646.3
1921	646.4
1922	646.5
1923	646.7
1924	646.8
1925	646.9
1926	647
1927	647.1
1928	647.3
1929	647.4
1930	647.5
1931	647.6
1932	647.7
1933	647.9
1934	648
1935	648.1
1936	648.2
1937	648.3
1938	648.5
1939	648.6
1940	648.7
1941	648.8
1942	649
1943	649.1
1944	649.2
1945	649.3
1946	649.4
1947	649.6
1948	649.7
1949	649.8
1950	649.9
1951	660.6
1952	671.3
1953	682.5
1954	692.9
1955	704.5
1956	715.9
1957	727.7
1958	739.4
1959	751.9
1960	757.7
1961	747.3
1962	736.3
1963	769.9
1964	789.8
1965	784.3
1966	800.1
1967	808.8
1968	821
1969	799.1
1970	829.7
1971	839.3
1972	862.8
1973	822.6
1974	784
1975	872
1976	967.2
1977	1019
1978	978.2
1979	1196
1980	1040
1981	989.1
1982	917.1
1983	941.7
1984	966.5
1985	971.4
1986	1015
1987	1015
1988	995
1989	1076
1990	1063
1991	1032
1992	1097
1993	1049
1994	1053
1995	1103
1996	1125
1997	1173
1998	1202
1999	1253
2000	1268
2001	1388
2002	1412
2003	1476
2004	1474
2005	1524
2006	1555
2007	1572
2008	1600
2009	1621
2010	1664
2011	1658
2012	1608
2013	1587
2014	1638
2015	1668
2016	1696
2017	1721
2018	1748
2019	1770