Year	Measure
1800	815.5
1801	815.6
1802	815.6
1803	815.7
1804	815.8
1805	815.9
1806	816
1807	816.1
1808	816.1
1809	816.2
1810	816.3
1811	816.4
1812	816.5
1813	816.6
1814	816.6
1815	816.7
1816	816.8
1817	816.9
1818	817
1819	817.1
1820	817.1
1821	821.6
1822	826
1823	830.4
1824	834.9
1825	839.4
1826	843.9
1827	848.5
1828	853
1829	857.6
1830	862.3
1831	866.9
1832	871.6
1833	876.3
1834	881
1835	885.7
1836	890.5
1837	895.3
1838	900.1
1839	905
1840	909.8
1841	914.7
1842	919.7
1843	924.6
1844	929.6
1845	934.6
1846	939.7
1847	944.7
1848	949.8
1849	954.9
1850	960.1
1851	965.2
1852	970.4
1853	975.7
1854	980.9
1855	986.2
1856	991.5
1857	996.9
1858	1002
1859	1008
1860	1013
1861	1019
1862	1024
1863	1030
1864	1035
1865	1041
1866	1046
1867	1052
1868	1058
1869	1063
1870	1069
1871	1075
1872	1081
1873	1086
1874	1092
1875	1098
1876	1104
1877	1110
1878	1116
1879	1122
1880	1128
1881	1134
1882	1140
1883	1146
1884	1152
1885	1159
1886	1113
1887	1300
1888	1249
1889	1161
1890	1155
1891	1057
1892	1156
1893	1309
1894	1486
1895	1374
1896	1512
1897	1485
1898	1524
1899	1615
1900	1579
1901	1617
1902	1755
1903	1633
1904	1804
1905	1595
1906	1523
1907	1462
1908	1595
1909	1655
1910	1764
1911	1628
1912	1758
1913	1845
1914	1760
1915	1810
1916	1607
1917	1410
1918	862.3
1919	742.7
1920	745
1921	681.3
1922	790.1
1923	909.2
1924	1151
1925	1437
1926	1612
1927	1677
1928	1762
1929	1781
1930	1860
1931	1875
1932	1844
1933	1912
1934	2085
1935	2382
1936	2541
1937	2750
1938	2739
1939	2848
1940	2727
1941	2673
1942	2620
1943	2569
1944	2518
1945	2469
1946	2420
1947	2686
1948	3032
1949	3308
1950	3580
1951	3532
1952	3693
1953	3785
1954	3899
1955	4155
1956	4468
1957	4476
1958	4724
1959	4584
1960	4925
1961	5115
1962	5168
1963	4974
1964	5541
1965	5784
1966	5996
1967	6195
1968	6493
1969	6522
1970	6959
1971	7074
1972	7044
1973	7563
1974	7671
1975	7582
1976	7826
1977	7899
1978	7987
1979	7843
1980	7750
1981	7718
1982	7804
1983	7945
1984	7931
1985	7892
1986	8103
1987	8098
1988	8163
1989	8202
1990	7912
1991	7740
1992	5906
1993	4491
1994	3570
1995	3125
1996	3150
1997	3321
1998	3644
1999	3906
2000	4329
2001	4744
2002	5228
2003	5790
2004	6426
2005	7944
2006	10550
2007	13020
2008	14240
2009	15360
2010	15940
2011	15750
2012	15880
2013	16670
2014	17350
2015	18010
2016	18490
2017	18930
2018	19530
2019	20200