Year	Measure
1800	702.1
1820	702.1
1821	671.3
1822	674.9
1823	672.2
1824	655.8
1825	675.3
1826	680.4
1827	683.3
1828	678.3
1829	682.3
1830	671.7
1831	670.8
1832	679.5
1833	676.8
1834	691.3
1835	706.8
1836	701.5
1837	718.1
1838	721.2
1839	722.5
1840	759.9
1841	761.1
1842	769.8
1843	784.8
1844	787.7
1845	802.7
1846	821
1847	829.8
1848	855
1849	906.1
1850	942.9
1851	959
1852	977.8
1853	946.8
1854	964.4
1855	998.5
1856	1000
1857	1023
1858	1057
1859	1081
1860	1107
1861	1096
1862	1081
1863	1112
1864	1159
1865	1186
1866	1200
1867	1141
1868	1186
1869	1292
1870	1306
1871	1289
1872	1365
1873	1434
1874	1353
1875	1443
1876	1407
1877	1341
1878	1401
1879	1591
1880	1761
1881	1796
1882	1918
1883	1902
1884	1892
1885	1809
1886	1859
1887	1962
1888	1858
1889	1881
1890	1990
1891	2124
1892	2054
1893	2128
1894	2067
1895	2184
1896	2169
1897	2095
1898	2320
1899	2306
1900	2220
1901	2249
1902	2320
1903	2165
1904	2315
1905	2286
1906	2437
1907	2538
1908	2776
1909	2759
1910	3036
1911	2921
1912	3004
1913	3024
1914	2527
1915	2418
1916	2930
1917	2959
1918	2961
1919	2510
1920	2802
1921	2398
1922	2455
1923	2919
1924	3099
1925	3190
1926	2885
1927	2793
1928	3373
1929	3497
1930	2893
1931	2244
1932	1867
1933	2263
1934	2688
1935	2795
1936	2882
1937	3220
1938	3199
1939	3207
1940	3275
1941	3179
1942	3265
1943	3295
1944	3295
1945	3513
1946	3744
1947	3279
1948	3757
1949	3612
1950	3714
1951	3776
1952	3940
1953	4162
1954	3954
1955	4023
1956	4005
1957	4316
1958	4445
1959	4091
1960	4322
1961	4419
1962	4519
1963	4695
1964	4694
1965	4632
1966	5045
1967	5107
1968	5189
1969	5283
1970	5295
1971	5665
1972	5494
1973	5094
1974	5052
1975	4325
1976	4399
1977	4757
1978	5071
1979	5409
1980	5749
1981	6004
1982	5096
1983	4868
1984	5071
1985	5091
1986	5291
1987	5547
1988	5851
1989	6359
1990	6479
1991	6877
1992	7596
1993	8001
1994	8501
1995	9082
1996	9620
1997	10120
1998	10310
1999	10110
2000	10440
2001	10670
2002	10780
2003	11080
2004	11650
2005	12260
2006	12850
2007	13380
2008	13650
2009	13400
2010	14040
2011	14740
2012	15400
2013	16020
2014	16620
2015	17230
2016	17890
2017	18570
2018	19280