Year	Measure
1800	883
1801	883
1802	883
1803	883
1804	883
1805	883
1806	883
1807	883
1808	883
1809	883
1810	883
1811	883
1812	883
1813	883
1814	883
1815	883
1816	883
1817	883
1818	883
1819	883
1820	883
1821	885.9
1822	888.8
1823	891.6
1824	894.5
1825	897.4
1826	900.4
1827	903.3
1828	906.2
1829	909.2
1830	912.1
1831	915.1
1832	918
1833	921
1834	924
1835	927
1836	930
1837	933
1838	936.1
1839	939.1
1840	942.2
1841	945.2
1842	948.3
1843	951.4
1844	954.5
1845	957.6
1846	960.7
1847	963.8
1848	966.9
1849	970.1
1850	973.2
1851	976.4
1852	979.5
1853	982.7
1854	985.9
1855	989.1
1856	992.3
1857	995.5
1858	998.8
1859	1002
1860	1005
1861	1009
1862	1012
1863	1015
1864	1018
1865	1022
1866	1025
1867	1028
1868	1032
1869	1035
1870	1038
1871	1042
1872	1045
1873	1049
1874	1052
1875	1055
1876	1059
1877	1062
1878	1066
1879	1069
1880	1073
1881	1076
1882	1080
1883	1083
1884	1087
1885	1090
1886	1094
1887	1097
1888	1101
1889	1104
1890	1108
1891	1112
1892	1115
1893	1119
1894	1122
1895	1126
1896	1130
1897	1133
1898	1137
1899	1141
1900	1144
1901	1148
1902	1152
1903	1156
1904	1159
1905	1163
1906	1167
1907	1171
1908	1175
1909	1178
1910	1182
1911	1186
1912	1190
1913	1194
1914	1261
1915	1332
1916	1407
1917	1486
1918	1570
1919	1658
1920	1751
1921	1850
1922	1954
1923	2064
1924	2180
1925	2302
1926	2432
1927	2569
1928	2713
1929	2866
1930	3027
1931	3198
1932	3378
1933	3568
1934	3768
1935	3980
1936	4204
1937	4441
1938	4691
1939	4955
1940	5234
1941	5528
1942	5839
1943	6168
1944	6515
1945	6881
1946	7268
1947	7677
1948	8109
1949	8566
1950	9048
1951	9557
1952	10090
1953	10660
1954	11260
1955	11900
1956	12570
1957	13270
1958	14020
1959	14810
1960	15640
1961	16520
1962	17450
1963	18430
1964	19470
1965	20570
1966	21720
1967	22950
1968	24240
1969	25600
1970	27040
1971	26070
1972	28700
1973	34260
1974	49070
1975	51290
1976	37390
1977	35640
1978	35990
1979	32520
1980	17470
1981	15420
1982	15610
1983	15070
1984	15040
1985	13340
1986	13010
1987	12640
1988	15040
1989	15380
1990	16110
1991	15130
1992	13800
1993	11770
1994	12290
1995	13250
1996	14230
1997	14160
1998	14070
1999	13020
2000	12810
2001	12800
2002	12220
2003	11970
2004	12490
2005	13100
2006	13430
2007	13640
2008	13430
2009	13740
2010	13920
2011	14080
2012	15140
2013	15170
2014	15280
2015	15470
2016	15700
2017	15930
2018	16120
2019	16310