Year	Measure
1800	871.3
1801	871.3
1802	871.3
1803	871.3
1804	871.3
1805	871.3
1806	871.3
1807	871.3
1808	871.3
1809	871.3
1810	871.3
1811	871.3
1812	871.3
1813	871.3
1814	871.3
1815	871.3
1816	871.3
1817	871.3
1818	871.3
1819	871.3
1820	871.3
1821	871.3
1822	871.3
1823	871.3
1824	871.3
1825	871.3
1826	871.3
1827	871.3
1828	871.3
1829	871.3
1830	871.3
1831	871.3
1832	871.3
1833	871.3
1834	871.3
1835	871.3
1836	871.3
1837	871.3
1838	871.3
1839	871.3
1840	871.3
1841	871.3
1842	871.3
1843	871.4
1844	871.4
1845	871.4
1846	871.4
1847	871.4
1848	871.4
1849	871.4
1850	871.4
1851	871.4
1852	871.4
1853	871.4
1854	871.4
1855	871.4
1856	871.4
1857	871.4
1858	871.4
1859	871.4
1860	871.4
1861	871.4
1862	871.4
1863	871.4
1864	871.4
1865	871.4
1866	871.4
1867	871.4
1868	871.4
1869	871.4
1870	871.4
1871	874.3
1872	877.2
1873	880
1874	882.9
1875	885.8
1876	888.7
1877	891.6
1878	894.5
1879	897.5
1880	900.4
1881	903.4
1882	906.3
1883	909.3
1884	912.3
1885	915.3
1886	918.3
1887	921.3
1888	924.3
1889	927.3
1890	930.3
1891	933.4
1892	936.5
1893	939.5
1894	942.6
1895	945.7
1896	948.8
1897	951.9
1898	955
1899	958.1
1900	961.3
1901	964.4
1902	974.2
1903	1151
1904	1099
1905	904.9
1906	937.9
1907	1066
1908	1080
1909	1218
1910	1277
1911	1131
1912	1144
1913	1177
1914	1161
1915	1176
1916	1267
1917	1400
1918	1364
1919	1356
1920	1378
1921	1442
1922	1551
1923	1611
1924	1689
1925	1753
1926	1783
1927	1732
1928	1720
1929	1807
1930	1827
1931	1821
1932	1830
1933	1783
1934	1799
1935	1944
1936	1982
1937	1931
1938	1949
1939	1849
1940	1722
1941	1598
1942	1624
1943	1456
1944	1220
1945	647
1946	680.1
1947	851.2
1948	1052
1949	1172
1950	1304
1951	1359
1952	1468
1953	1550
1954	1638
1955	1708
1956	1737
1957	1801
1958	1859
1959	1932
1960	1984
1961	2048
1962	2137
1963	2265
1964	2465
1965	2664
1966	2821
1967	3043
1968	3244
1969	3453
1970	3757
1971	4141
1972	4590
1973	5072
1974	5025
1975	5160
1976	5754
1977	6207
1978	6909
1979	7328
1980	7672
1981	7980
1982	8086
1983	8594
1984	9353
1985	9662
1986	10620
1987	11820
1988	12590
1989	13460
1990	14120
1991	14990
1992	15960
1993	16850
1994	17870
1995	18790
1996	19750
1997	20810
1998	21490
1999	22480
2000	23530
2001	22770
2002	23490
2003	24060
2004	25330
2005	26070
2006	27360
2007	28890
2008	29000
2009	28380
2010	31370
2011	32560
2012	32840
2013	33680
2014	34840
2015	36220
2016	37690
2017	39360
2018	41170