Year	Measure
1764	568.2
1765	568
1766	567.9
1767	567.7
1768	567.6
1769	567.4
1770	567.3
1771	567.1
1772	567
1773	566.9
1774	566.7
1775	566.6
1776	566.4
1777	566.3
1778	566.1
1779	566
1780	565.8
1781	565.7
1782	565.5
1783	565.4
1784	565.2
1785	565.1
1786	564.9
1787	564.8
1788	564.6
1789	564.5
1790	564.4
1791	564.2
1792	564.1
1793	563.9
1794	563.8
1795	563.6
1796	563.5
1797	563.3
1798	563.2
1799	563
1800	562.9
1801	562.7
1802	562.6
1803	562.4
1804	562.3
1805	562.2
1806	562
1807	561.9
1808	561.7
1809	561.6
1810	561.4
1811	561.3
1812	561.1
1813	561
1814	560.8
1815	560.7
1816	560.5
1817	560.4
1818	560.3
1819	560.1
1820	560
1821	560
1822	560
1823	560
1824	559.9
1825	559.9
1826	559.9
1827	559.9
1828	559.9
1829	559.9
1830	559.9
1831	559.9
1832	559.9
1833	559.9
1834	559.9
1835	559.9
1836	559.9
1837	559.9
1838	559.9
1839	559.9
1840	559.9
1841	559.9
1842	559.9
1843	559.9
1844	559.9
1845	559.9
1846	559.9
1847	559.9
1848	559.9
1849	559.9
1850	559.9
1851	559.9
1852	559.9
1853	559.9
1854	559.9
1855	559.9
1856	559.9
1857	559.9
1858	559.9
1859	559.9
1860	559.9
1861	559.9
1862	559.9
1863	560
1864	560
1865	560
1866	560
1867	560
1868	560
1869	560
1870	560
1871	560.5
1872	561
1873	561.5
1874	562
1875	562.6
1876	563.1
1877	563.6
1878	564.1
1879	564.6
1880	565.1
1881	565.6
1882	566.1
1883	566.7
1884	567.2
1885	583.1
1886	562.8
1887	586.5
1888	590
1889	572.1
1890	596.8
1891	540.3
1892	581.8
1893	594.7
1894	601.9
1895	585.3
1896	540.5
1897	637.2
1898	636.5
1899	585.1
1900	603.8
1901	611.6
1902	657.7
1903	662.1
1904	660.3
1905	643.5
1906	656.9
1907	612.6
1908	616.7
1909	696.3
1910	692.3
1911	685.5
1912	682.6
1913	665.6
1914	700.3
1915	681.7
1916	700
1917	685.7
1918	596.6
1919	677.5
1920	622.4
1921	665
1922	685.2
1923	655.3
1924	679.5
1925	679.7
1926	693
1927	685.3
1928	684.3
1929	704.5
1930	701.5
1931	686.5
1932	683.6
1933	673.8
1934	669.7
1935	653.3
1936	668.2
1937	647.3
1938	639
1939	643.2
1940	654.3
1941	657.6
1942	646.1
1943	662.9
1944	647.4
1945	628.7
1946	587.9
1947	583.1
1948	581.7
1949	587.9
1950	580
1951	582.9
1952	588.1
1953	613
1954	625.9
1955	628.7
1956	651.1
1957	630.6
1958	663.2
1959	663.6
1960	696.1
1961	699.9
1962	698.7
1963	716.9
1964	754.7
1965	707.4
1966	698.4
1967	738.6
1968	739.1
1969	771
1970	791.1
1971	779.3
1972	757.9
1973	774.4
1974	764.5
1975	812.2
1976	803.9
1977	845.5
1978	870.4
1979	805.9
1980	843.6
1981	876.8
1982	883.4
1983	933.5
1984	947.2
1985	962.9
1986	981.7
1987	1001
1988	1081
1989	1127
1990	1160
1991	1150
1992	1186
1993	1227
1994	1290
1995	1354
1996	1433
1997	1475
1998	1543
1999	1607
2000	1648
2001	1714
2002	1754
2003	1872
2004	1981
2005	2126
2006	2293
2007	2488
2008	2606
2009	2700
2010	2961
2011	3147
2012	3229
2013	3368
2014	3532
2015	3717
2016	3920
2017	4137
2018	4368