Year	Measure
1800	815.8
1801	815.8
1802	815.8
1803	815.8
1804	815.8
1805	815.8
1806	815.8
1807	815.8
1808	815.8
1809	815.8
1810	815.8
1811	815.8
1812	815.8
1813	815.8
1814	815.8
1815	815.8
1816	815.8
1817	815.8
1818	815.8
1819	815.8
1820	815.8
1821	824.8
1822	834
1823	843.2
1824	852.5
1825	862
1826	871.6
1827	881.2
1828	891
1829	900.9
1830	910.8
1831	920.9
1832	931.2
1833	941.5
1834	951.9
1835	962.5
1836	973.1
1837	983.9
1838	994.8
1839	1006
1840	1017
1841	1028
1842	1040
1843	1051
1844	1063
1845	1075
1846	1087
1847	1099
1848	1111
1849	1123
1850	1136
1851	1148
1852	1161
1853	1174
1854	1187
1855	1200
1856	1213
1857	1227
1858	1240
1859	1254
1860	1268
1861	1282
1862	1296
1863	1311
1864	1325
1865	1340
1866	1355
1867	1370
1868	1385
1869	1400
1870	1416
1871	1431
1872	1447
1873	1463
1874	1479
1875	1496
1876	1512
1877	1529
1878	1546
1879	1563
1880	1581
1881	1598
1882	1616
1883	1634
1884	1652
1885	1670
1886	1689
1887	1707
1888	1726
1889	1746
1890	1765
1891	1784
1892	1804
1893	1824
1894	1844
1895	1865
1896	1886
1897	1906
1898	1928
1899	1949
1900	1971
1901	1992
1902	2015
1903	2037
1904	2059
1905	2082
1906	2105
1907	2129
1908	2152
1909	2176
1910	2200
1911	2225
1912	2249
1913	2274
1914	2299
1915	2325
1916	2351
1917	2377
1918	2403
1919	2430
1920	2457
1921	2350
1922	2558
1923	2311
1924	2585
1925	2519
1926	2727
1927	2475
1928	2550
1929	2393
1930	2460
1931	2382
1932	2150
1933	2512
1934	2174
1935	2311
1936	2421
1937	2726
1938	2839
1939	2825
1940	2667
1941	2939
1942	2553
1943	2510
1944	2207
1945	2442
1946	2661
1947	3080
1948	3169
1949	3213
1950	2970
1951	2952
1952	3198
1953	3560
1954	3463
1955	3722
1956	3481
1957	3640
1958	3941
1959	3931
1960	4108
1961	4119
1962	4213
1963	4416
1964	4480
1965	4730
1966	4930
1967	5066
1968	5291
1969	5480
1970	5679
1971	5884
1972	6231
1973	6534
1974	6703
1975	6651
1976	6817
1977	7215
1978	7368
1979	7503
1980	7429
1981	7082
1982	6407
1983	6400
1984	6705
1985	6567
1986	6727
1987	6854
1988	6900
1989	7108
1990	7182
1991	7165
1992	7499
1993	7760
1994	7923
1995	7931
1996	7845
1997	8128
1998	8651
1999	9298
2000	9340
2001	9285
2002	9402
2003	9859
2004	10110
2005	10540
2006	11240
2007	11890
2008	11970
2009	11620
2010	12320
2011	12690
2012	13170
2013	13340
2014	13540
2015	13790
2016	14070
2017	14380
2018	14700
2019	15020