Year	Measure
1764	882.6
1765	884
1766	885.4
1767	886.8
1768	888.2
1769	889.6
1770	891
1771	892.4
1772	893.9
1773	895.3
1774	896.7
1775	898.1
1776	899.5
1777	901
1778	902.4
1779	903.8
1780	905.3
1781	906.7
1782	908.1
1783	909.6
1784	911
1785	912.5
1786	913.9
1787	915.4
1788	916.8
1789	918.3
1790	919.7
1791	921.2
1792	922.6
1793	924.1
1794	925.6
1795	927
1796	928.5
1797	930
1798	931.5
1799	932.9
1800	934.4
1801	935.9
1802	937.4
1803	938.9
1804	940.4
1805	941.8
1806	943.3
1807	944.8
1808	946.3
1809	947.8
1810	949.3
1811	950.8
1812	952.4
1813	953.9
1814	955.4
1815	956.9
1816	958.4
1817	959.9
1818	961.5
1819	963
1820	964.5
1821	972.3
1822	980.2
1823	988.1
1824	996.1
1825	1004
1826	1012
1827	1020
1828	1029
1829	1037
1830	1045
1831	1054
1832	1062
1833	1071
1834	1080
1835	1088
1836	1097
1837	1106
1838	1115
1839	1124
1840	1133
1841	1142
1842	1151
1843	1161
1844	1170
1845	1179
1846	1189
1847	1199
1848	1208
1849	1218
1850	1228
1851	1233
1852	1237
1853	1242
1854	1247
1855	1251
1856	1256
1857	1261
1858	1265
1859	1270
1860	1275
1861	1280
1862	1285
1863	1290
1864	1294
1865	1299
1866	1304
1867	1309
1868	1314
1869	1319
1870	1324
1871	1344
1872	1363
1873	1383
1874	1404
1875	1424
1876	1445
1877	1466
1878	1488
1879	1510
1880	1532
1881	1554
1882	1577
1883	1601
1884	1624
1885	1648
1886	1672
1887	1697
1888	1722
1889	1747
1890	1773
1891	1797
1892	1822
1893	1847
1894	1872
1895	1898
1896	1924
1897	1951
1898	1978
1899	2005
1900	2033
1901	2059
1902	2085
1903	2111
1904	2138
1905	2165
1906	2193
1907	2220
1908	2249
1909	2277
1910	2306
1911	2335
1912	2365
1913	2395
1914	2455
1915	2517
1916	2580
1917	2644
1918	2711
1919	2779
1920	2848
1921	2920
1922	2993
1923	3035
1924	3145
1925	3276
1926	3342
1927	3409
1928	3436
1929	3607
1930	3483
1931	3297
1932	3540
1933	3709
1934	3751
1935	3853
1936	3820
1937	4314
1938	4177
1939	4121
1940	3478
1941	2937
1942	2478
1943	2086
1944	1756
1945	1478
1946	2188
1947	2787
1948	2847
1949	2962
1950	3040
1951	3278
1952	3269
1953	3683
1954	3766
1955	4020
1956	4334
1957	4585
1958	4759
1959	4890
1960	5067
1961	5473
1962	5653
1963	6214
1964	6710
1965	7316
1966	7717
1967	8056
1968	8582
1969	9411
1970	10150
1971	10840
1972	12130
1973	12570
1974	12080
1975	12710
1976	13360
1977	13630
1978	14380
1979	14740
1980	14880
1981	14770
1982	14770
1983	14770
1984	15120
1985	15560
1986	15790
1987	15700
1988	16410
1989	16990
1990	16850
1991	17190
1992	17210
1993	16870
1994	17150
1995	17490
1996	17890
1997	18530
1998	19150
1999	19800
2000	20680
2001	21590
2002	22420
2003	23530
2004	24590
2005	25520
2006	26870
2007	27760
2008	27260
2009	26320
2010	24950
2011	23110
2012	21810
2013	20960
2014	21120
2015	21770
2016	22600
2017	23420
2018	24220