Year	Measure
1800	585.6
1801	585.7
1802	585.9
1803	586
1804	586.1
1805	586.3
1806	586.4
1807	586.5
1808	586.7
1809	586.8
1810	586.9
1811	587.1
1812	587.2
1813	587.3
1814	587.5
1815	587.6
1816	587.7
1817	587.9
1818	588
1819	588.1
1820	588.3
1821	591.5
1822	594.8
1823	598
1824	601.3
1825	604.6
1826	608
1827	611.3
1828	614.7
1829	618.1
1830	621.5
1831	624.9
1832	628.4
1833	631.8
1834	635.3
1835	638.8
1836	642.3
1837	645.9
1838	649.4
1839	653
1840	656.6
1841	660.2
1842	663.9
1843	667.5
1844	671.2
1845	674.9
1846	678.6
1847	682.4
1848	686.1
1849	689.9
1850	693.7
1851	697.5
1852	701.4
1853	705.3
1854	709.1
1855	713
1856	717
1857	720.9
1858	724.9
1859	728.9
1860	732.9
1861	737
1862	741
1863	745.1
1864	749.2
1865	753.3
1866	757.5
1867	761.7
1868	765.9
1869	770.1
1870	774.3
1871	778.6
1872	782.9
1873	787.2
1874	791.5
1875	795.9
1876	800.3
1877	804.7
1878	809.1
1879	813.6
1880	818.1
1881	822.6
1882	827.1
1883	831.7
1884	836.3
1885	840.9
1886	807.8
1887	943.7
1888	907.1
1889	842.8
1890	838.6
1891	767.5
1892	839.6
1893	950.6
1894	1080
1895	998.6
1896	1099
1897	1080
1898	1107
1899	1174
1900	1148
1901	1176
1902	1277
1903	1188
1904	1312
1905	1160
1906	1108
1907	1064
1908	1161
1909	1204
1910	1284
1911	1185
1912	1280
1913	1343
1914	1282
1915	1318
1916	1171
1917	1027
1918	628.4
1919	541.3
1920	543.1
1921	496.7
1922	576.1
1923	663
1924	839.2
1925	1048
1926	1176
1927	1224
1928	1286
1929	1300
1930	1357
1931	1368
1932	1346
1933	1396
1934	1522
1935	1739
1936	1856
1937	2008
1938	2001
1939	2081
1940	1992
1941	1953
1942	1915
1943	1878
1944	1841
1945	1805
1946	1770
1947	1965
1948	2218
1949	2420
1950	2619
1951	2584
1952	2703
1953	2770
1954	2854
1955	3041
1956	3272
1957	3278
1958	3459
1959	3358
1960	3607
1961	3747
1962	3786
1963	3644
1964	4059
1965	4237
1966	4392
1967	4538
1968	4756
1969	4778
1970	5098
1971	5182
1972	5160
1973	5540
1974	5500
1975	5322
1976	5377
1977	5312
1978	5258
1979	5054
1980	4888
1981	4765
1982	4716
1983	4700
1984	4593
1985	4473
1986	4496
1987	4398
1988	4339
1989	4268
1990	4030
1991	3588
1992	2377
1993	1961
1994	1520
1995	1310
1996	1073
1997	1072
1998	1108
1999	1126
2000	1195
2001	1289
2002	1382
2003	1491
2004	1614
2005	1686
2006	1767
2007	1865
2008	1969
2009	2004
2010	2110
2011	2212
2012	2329
2013	2450
2014	2548
2015	2639
2016	2734
2017	2832
2018	2933
2019	3038