Year	Measure
1820	742.4
1821	743.9
1822	745.3
1823	746.8
1824	748.3
1825	749.8
1826	751.2
1827	752.7
1828	754.2
1829	755.7
1830	757.2
1831	758.7
1832	760.2
1833	761.7
1834	763.2
1835	764.7
1836	766.2
1837	767.7
1838	769.3
1839	770.8
1840	772.3
1841	773.8
1842	775.3
1843	776.9
1844	778.4
1845	780
1846	781.5
1847	783
1848	784.6
1849	786.1
1850	787.7
1851	842
1852	819.3
1853	768.9
1854	742.6
1855	749.7
1856	776.9
1857	831.4
1858	884.9
1859	877.8
1860	901
1861	893
1862	850.6
1863	869.8
1864	881.9
1865	947.4
1866	981.7
1867	1063
1868	1063
1869	1063
1870	985.8
1871	985.8
1872	1020
1873	989.8
1874	1005
1875	1020
1876	981.7
1877	954.5
1878	1001
1879	1009
1880	962.6
1881	970.6
1882	993.9
1883	966.6
1884	1032
1885	958.5
1886	989.8
1887	924.2
1888	888.9
1889	901
1890	985.8
1891	1047
1892	908.1
1893	772.9
1894	772.9
1895	916.2
1896	831.4
1897	819.3
1898	838.5
1899	823.3
1900	792.1
1901	893.2
1902	867.3
1903	869
1904	857.5
1905	871.3
1906	959.9
1907	952.1
1908	901.7
1909	971.7
1910	979.8
1911	1016
1912	1061
1913	1072
1914	1033
1915	1017
1916	1005
1917	1079
1918	1032
1919	1092
1920	1206
1921	1204
1922	1275
1923	1355
1924	1350
1925	1322
1926	1362
1927	1482
1928	1622
1929	1604
1930	1540
1931	1455
1932	1489
1933	1594
1934	1704
1935	1722
1936	1893
1937	1942
1938	1989
1939	1997
1940	1937
1941	1989
1942	1887
1943	2007
1944	2120
1945	2140
1946	2335
1947	2333
1948	2498
1949	2622
1950	2727
1951	2782
1952	2905
1953	2955
1954	3098
1955	3277
1956	3273
1957	3426
1958	3692
1959	3942
1960	4193
1961	4427
1962	4596
1963	4490
1964	4513
1965	4491
1966	4663
1967	4724
1968	5051
1969	5385
1970	5763
1971	6273
1972	6867
1973	7656
1974	8090
1975	8307
1976	8953
1977	9173
1978	9401
1979	9804
1980	10500
1981	9819
1982	9684
1983	9190
1984	9490
1985	10040
1986	10580
1987	10750
1988	10550
1989	10690
1990	9830
1991	9776
1992	9573
1993	9900
1994	10330
1995	10620
1996	10760
1997	10960
1998	10830
1999	10770
2000	11100
2001	11050
2002	11200
2003	11170
2004	11650
2005	11840
2006	12180
2007	12800
2008	13330
2009	13170
2010	14040
2011	14300
2012	14330
2013	14530
2014	14670
2015	14930
2016	15260
2017	15620
2018	16020
2019	16470