Year	Measure
1800	653.6
1801	653.6
1802	653.6
1803	653.6
1804	653.6
1805	653.6
1806	653.6
1807	653.6
1808	653.6
1809	653.6
1810	653.6
1811	653.6
1812	653.7
1813	653.7
1814	653.7
1815	653.7
1816	653.7
1817	653.7
1818	653.7
1819	653.7
1820	653.7
1821	657.1
1822	660.6
1823	664.1
1824	667.6
1825	671.2
1826	674.7
1827	678.3
1828	681.9
1829	685.5
1830	689.1
1831	692.7
1832	696.4
1833	700.1
1834	703.8
1835	707.5
1836	711.3
1837	715
1838	718.8
1839	722.6
1840	726.4
1841	730.3
1842	734.1
1843	738
1844	741.9
1845	745.9
1846	749.8
1847	753.8
1848	757.8
1849	761.8
1850	765.8
1851	769.8
1852	773.9
1853	778
1854	782.1
1855	786.3
1856	790.4
1857	794.6
1858	798.8
1859	803
1860	807.3
1861	811.6
1862	815.9
1863	820.2
1864	824.5
1865	828.9
1866	833.3
1867	837.7
1868	842.1
1869	846.6
1870	851
1871	855.5
1872	860.1
1873	864.6
1874	869.2
1875	873.8
1876	878.4
1877	883.1
1878	887.7
1879	892.4
1880	897.1
1881	901.9
1882	906.7
1883	911.5
1884	916.3
1885	921.1
1886	884.6
1887	1033
1888	993
1889	922.4
1890	917.6
1891	839.7
1892	918.3
1893	1040
1894	1181
1895	1091
1896	1201
1897	1180
1898	1210
1899	1282
1900	1253
1901	1283
1902	1393
1903	1296
1904	1431
1905	1266
1906	1208
1907	1160
1908	1265
1909	1312
1910	1399
1911	1291
1912	1394
1913	1463
1914	1395
1915	1434
1916	1274
1917	1117
1918	683.4
1919	588.5
1920	590.3
1921	539.8
1922	625.9
1923	720.2
1924	911.4
1925	1138
1926	1276
1927	1328
1928	1395
1929	1410
1930	1472
1931	1484
1932	1459
1933	1513
1934	1650
1935	1884
1936	2011
1937	2175
1938	2167
1939	2252
1940	2156
1941	2113
1942	2072
1943	2031
1944	1990
1945	1951
1946	1913
1947	2123
1948	2396
1949	2614
1950	2829
1951	2790
1952	2917
1953	2990
1954	3079
1955	3281
1956	3528
1957	3534
1958	3729
1959	3618
1960	3887
1961	4037
1962	4079
1963	3926
1964	4373
1965	4565
1966	4733
1967	4889
1968	5125
1969	5148
1970	5492
1971	5583
1972	5559
1973	5969
1974	6088
1975	6051
1976	6280
1977	6374
1978	6480
1979	6399
1980	6358
1981	6367
1982	6473
1983	6627
1984	6652
1985	6655
1986	6872
1987	6905
1988	6999
1989	7072
1990	6859
1991	5621
1992	3973
1993	3915
1994	2703
1995	2667
1996	2515
1997	2560
1998	2397
1999	2317
2000	2367
2001	2511
2002	2705
2003	2872
2004	3080
2005	3304
2006	3472
2007	3585
2008	3874
2009	3647
2010	3910
2011	4179
2012	4150
2013	4517
2014	4676
2015	4888
2016	5109
2017	5315
2018	5529
2019	5751