Year	Measure
1800	666.9
1801	666.9
1802	666.9
1803	666.9
1804	666.9
1805	666.9
1806	666.9
1807	666.9
1808	666.9
1809	666.9
1810	666.9
1811	666.9
1812	666.9
1813	666.9
1814	666.9
1815	666.9
1816	666.9
1817	666.9
1818	666.9
1819	666.9
1820	666.9
1821	669.8
1822	672.6
1823	675.5
1824	678.4
1825	681.3
1826	684.2
1827	687.2
1828	690.1
1829	693.1
1830	696.1
1831	699
1832	702
1833	705
1834	708.1
1835	711.1
1836	714.2
1837	717.2
1838	720.3
1839	723.4
1840	726.5
1841	729.6
1842	732.7
1843	735.9
1844	739
1845	742.2
1846	745.4
1847	748.6
1848	751.8
1849	755
1850	758.3
1851	761.5
1852	764.8
1853	768
1854	771.3
1855	774.7
1856	778
1857	781.3
1858	784.7
1859	788
1860	791.4
1861	794.8
1862	798.2
1863	801.6
1864	805.1
1865	808.5
1866	812
1867	815.5
1868	819
1869	822.5
1870	826
1871	850
1872	874.7
1873	900.1
1874	926.2
1875	953.1
1876	980.8
1877	1009
1878	1039
1879	1069
1880	1100
1881	1132
1882	1165
1883	1198
1884	1230
1885	1301
1886	1217
1887	1338
1888	1371
1889	1317
1890	1387
1891	1240
1892	1061
1893	1471
1894	1249
1895	1430
1896	1259
1897	1140
1898	1272
1899	1248
1900	1192
1901	1156
1902	1243
1903	1327
1904	1272
1905	1249
1906	1160
1907	1150
1908	1221
1909	1256
1910	1285
1911	1362
1912	1397
1913	1605
1914	1389
1915	1422
1916	1337
1917	1553
1918	1536
1919	1428
1920	1705
1921	1693
1922	1756
1923	2022
1924	2414
1925	3101
1926	3697
1927	3908
1928	4435
1929	4907
1930	4915
1931	4107
1932	4227
1933	4120
1934	4351
1935	4796
1936	4956
1937	5463
1938	5686
1939	5942
1940	5633
1941	5591
1942	5024
1943	5273
1944	6524
1945	7537
1946	8707
1947	10340
1948	11930
1949	11670
1950	11130
1951	11330
1952	11600
1953	11660
1954	12240
1955	12660
1956	13570
1957	14790
1958	13680
1959	13630
1960	13150
1961	12540
1962	12710
1963	12610
1964	13950
1965	14220
1966	13970
1967	14400
1968	14940
1969	14930
1970	15580
1971	15730
1972	15850
1973	16550
1974	17230
1975	17900
1976	19140
1977	19830
1978	19680
1979	19320
1980	18290
1981	17700
1982	16830
1983	15150
1984	14330
1985	13980
1986	14200
1987	14910
1988	15620
1989	14220
1990	14640
1991	15450
1992	16190
1993	15890
1994	14950
1995	14990
1996	14670
1997	15340
1998	15110
1999	13950
2000	14230
2001	14490
2002	12980
2003	11780
2004	13760
2005	14900
2006	16150
2007	17280
2008	17900
2009	17050
2010	16530
2011	16960
2012	17640
2013	17540
2014	17180
2015	16750
2016	16660
2017	16570
2018	16470
2019	16380