Year	Measure
1800	948.5
1801	948.5
1802	948.5
1803	948.5
1804	948.5
1805	948.5
1806	948.5
1807	948.5
1808	948.5
1809	948.5
1810	948.5
1811	948.5
1812	948.5
1813	948.5
1814	948.5
1815	948.5
1816	948.5
1817	948.5
1818	948.5
1819	948.5
1820	948.5
1821	961.9
1822	975.5
1823	989.3
1824	1003
1825	1017
1826	1032
1827	1046
1828	1061
1829	1076
1830	1091
1831	1107
1832	1122
1833	1138
1834	1154
1835	1171
1836	1187
1837	1204
1838	1221
1839	1238
1840	1256
1841	1273
1842	1291
1843	1310
1844	1328
1845	1347
1846	1366
1847	1385
1848	1405
1849	1425
1850	1445
1851	1465
1852	1486
1853	1507
1854	1528
1855	1550
1856	1572
1857	1594
1858	1616
1859	1639
1860	1662
1861	1686
1862	1710
1863	1734
1864	1758
1865	1783
1866	1808
1867	1834
1868	1860
1869	1886
1870	1913
1871	1940
1872	1967
1873	1995
1874	2023
1875	2052
1876	2032
1877	2179
1878	2002
1879	2027
1880	1926
1881	1897
1882	2330
1883	2540
1884	2641
1885	3015
1886	2933
1887	3042
1888	3435
1889	3662
1890	3246
1891	2971
1892	3457
1893	3555
1894	3988
1895	4298
1896	4621
1897	3610
1898	3807
1899	4365
1900	3721
1901	3931
1902	3740
1903	4169
1904	4496
1905	4965
1906	4984
1907	4858
1908	5109
1909	5124
1910	5259
1911	5143
1912	5358
1913	5199
1914	4453
1915	4299
1916	4100
1917	3697
1918	4311
1919	4395
1920	4639
1921	4617
1922	4845
1923	5232
1924	5480
1925	5290
1926	5400
1927	5635
1928	5830
1929	5938
1930	5530
1931	5043
1932	4781
1933	4917
1934	5213
1935	5342
1936	5303
1937	5604
1938	5533
1939	5658
1940	5661
1941	5869
1942	5842
1943	5711
1944	6266
1945	5967
1946	6361
1947	6921
1948	7139
1949	6881
1950	6805
1951	6924
1952	6433
1953	6647
1954	6794
1955	7146
1956	7215
1957	7462
1958	7790
1959	7156
1960	7601
1961	8017
1962	7763
1963	7457
1964	8111
1965	8730
1966	8658
1967	8764
1968	9015
1969	9654
1970	10030
1971	10240
1972	10280
1973	10480
1974	10870
1975	10630
1976	10460
1977	10970
1978	10450
1979	11020
1980	11020
1981	10250
1982	9792
1983	10050
1984	10120
1985	9278
1986	9823
1987	9946
1988	9626
1989	8823
1990	8539
1991	9333
1992	10130
1993	10600
1994	11110
1995	10670
1996	11150
1997	11940
1998	12270
1999	11720
2000	11500
2001	10870
2002	9574
2003	10320
2004	11140
2005	12040
2006	12910
2007	13870
2008	14650
2009	14610
2010	15770
2011	16970
2012	17100
2013	17630
2014	17520
2015	17500
2016	17560
2017	17710
2018	17860
2019	18020