Year	Measure
1800	838.8
1801	838.8
1802	838.8
1803	838.8
1804	838.8
1805	838.8
1806	838.8
1807	838.8
1808	838.8
1809	838.8
1810	838.8
1811	838.8
1812	838.8
1813	838.8
1814	838.8
1815	838.8
1816	838.8
1817	838.8
1818	838.8
1819	838.8
1820	838.8
1821	841
1822	843.1
1823	845.2
1824	847.4
1825	849.5
1826	851.7
1827	853.8
1828	856
1829	858.2
1830	860.3
1831	862.5
1832	864.7
1833	866.9
1834	869.1
1835	871.3
1836	873.5
1837	875.7
1838	878
1839	880.2
1840	882.4
1841	884.7
1842	886.9
1843	889.2
1844	891.4
1845	893.7
1846	895.9
1847	898.2
1848	900.5
1849	902.8
1850	905.1
1851	907.4
1852	909.7
1853	912
1854	914.3
1855	916.6
1856	918.9
1857	921.3
1858	923.6
1859	925.9
1860	928.3
1861	930.6
1862	933
1863	935.4
1864	937.7
1865	940.1
1866	942.5
1867	944.9
1868	947.3
1869	949.7
1870	952.1
1871	954.5
1872	956.9
1873	959.4
1874	961.8
1875	964.2
1876	966.7
1877	969.1
1878	971.6
1879	974.1
1880	976.5
1881	979
1882	981.5
1883	984
1884	986.5
1885	989
1886	991.5
1887	994
1888	996.5
1889	999
1890	1002
1891	1004
1892	1007
1893	1009
1894	1012
1895	1014
1896	1017
1897	1019
1898	1022
1899	1025
1900	1027
1901	1030
1902	1032
1903	1035
1904	1038
1905	1040
1906	1043
1907	1046
1908	1048
1909	1051
1910	1054
1911	1056
1912	1059
1913	1062
1914	1064
1915	1067
1916	1070
1917	1072
1918	1075
1919	1078
1920	1081
1921	1083
1922	1086
1923	1089
1924	1092
1925	1094
1926	1097
1927	1100
1928	1115
1929	1130
1930	1146
1931	1161
1932	1177
1933	1193
1934	1209
1935	1226
1936	1242
1937	1259
1938	1276
1939	1294
1940	1311
1941	1329
1942	1347
1943	1366
1944	1384
1945	1403
1946	1422
1947	1442
1948	1461
1949	1481
1950	1501
1951	1551
1952	1561
1953	1584
1954	1633
1955	1645
1956	1665
1957	1685
1958	1689
1959	1741
1960	1750
1961	1745
1962	1720
1963	1714
1964	1752
1965	1780
1966	1862
1967	1929
1968	1962
1969	2044
1970	2117
1971	2163
1972	2180
1973	2201
1974	2212
1975	2065
1976	2103
1977	2063
1978	2120
1979	2155
1980	1956
1981	1817
1982	1786
1983	1670
1984	1620
1985	1564
1986	1539
1987	1573
1988	1634
1989	1703
1990	846.8
1991	738.7
1992	488.2
1993	331
1994	257.8
1995	240.4
1996	256.1
1997	493.3
1998	594.2
1999	684.7
2000	797.6
2001	794.8
2002	808.4
2003	550.2
2004	554.4
2005	567.4
2006	618.7
2007	640.3
2008	657.6
2009	675.8
2010	696.1
2011	729
2012	769.5
2013	809.8
2014	844.3
2015	894.7
2016	941.3
2017	989.5
2018	1039
2019	1090