Year	Measure
1820	878.6
1821	880.5
1822	882.4
1823	884.3
1824	886.1
1825	888
1826	889.9
1827	891.8
1828	893.7
1829	895.6
1830	897.5
1831	899.4
1832	901.3
1833	903.3
1834	905.2
1835	907.1
1836	909
1837	911
1838	912.9
1839	914.9
1840	916.8
1841	918.8
1842	920.7
1843	922.7
1844	924.6
1845	926.6
1846	928.6
1847	930.6
1848	932.5
1849	934.5
1850	936.5
1851	938.5
1852	940.5
1853	942.5
1854	944.5
1855	946.5
1856	948.5
1857	950.6
1858	952.6
1859	954.6
1860	956.6
1861	958.7
1862	960.7
1863	962.8
1864	964.8
1865	966.9
1866	968.9
1867	971
1868	973
1869	975.1
1870	977.2
1871	991.6
1872	1006
1873	1021
1874	1036
1875	1051
1876	1067
1877	1083
1878	1099
1879	1115
1880	1131
1881	1148
1882	1165
1883	1182
1884	1199
1885	1217
1886	1235
1887	1253
1888	1272
1889	1290
1890	1309
1891	1327
1892	1346
1893	1364
1894	1383
1895	1402
1896	1421
1897	1440
1898	1460
1899	1480
1900	1500
1901	1520
1902	1540
1903	1560
1904	1581
1905	1601
1906	1622
1907	1644
1908	1665
1909	1687
1910	1709
1911	1731
1912	1753
1913	1776
1914	1791
1915	1806
1916	1821
1917	1836
1918	1851
1919	1867
1920	1882
1921	1898
1922	1914
1923	1930
1924	1946
1925	1963
1926	1979
1927	1996
1928	2012
1929	2029
1930	2037
1931	2044
1932	2052
1933	2059
1934	2067
1935	2075
1936	2082
1937	2090
1938	2098
1939	2106
1940	2114
1941	2121
1942	2129
1943	2137
1944	2145
1945	2153
1946	2161
1947	2169
1948	2177
1949	2185
1950	2193
1951	2288
1952	2292
1953	2384
1954	2454
1955	2587
1956	2613
1957	2780
1958	2905
1959	3025
1960	3178
1961	3205
1962	3311
1963	3424
1964	3541
1965	3670
1966	3808
1967	3951
1968	4094
1969	4233
1970	4389
1971	4564
1972	4743
1973	4979
1974	4998
1975	5015
1976	5035
1977	5057
1978	5080
1979	5105
1980	5141
1981	5169
1982	5197
1983	5228
1984	5257
1985	5285
1986	5318
1987	5352
1988	5386
1989	5426
1990	5475
1991	3890
1992	3575
1993	3889
1994	4178
1995	4703
1996	5110
1997	4571
1998	5131
1999	5623
2000	6005
2001	6407
2002	6591
2003	6950
2004	7322
2005	7685
2006	8090
2007	8528
2008	9112
2009	9377
2010	9657
2011	9897
2012	10120
2013	10300
2014	10570
2015	10970
2016	11490
2017	12060
2018	12670
2019	13330