Year	Measure
1800	378.4
1820	378.4
1885	481.3
1886	461.7
1887	538.6
1888	517
1889	479.6
1890	476.6
1891	435.6
1892	475.7
1893	537.9
1894	610.2
1895	563.4
1896	619.2
1897	607.4
1898	622.2
1899	658.8
1900	643.2
1901	657.7
1902	713.1
1903	662.4
1904	730.9
1905	645.5
1906	615.6
1907	590.2
1908	643.1
1909	666.2
1910	709.2
1911	653.8
1912	704.8
1913	738.8
1914	703.9
1915	722.8
1916	700
1917	583.3
1918	486
1919	405
1920	384.5
1921	365
1922	395.9
1923	429.3
1924	465.6
1925	505
1926	547.6
1927	593.9
1928	644.1
1929	698.6
1930	728.5
1931	733.4
1932	720.5
1933	745.9
1934	812.5
1935	926.9
1936	987.8
1937	1067
1938	1062
1939	1102
1940	1054
1946	928.4
1947	1029
1948	1160
1949	1264
1950	1366
1951	1346
1952	1406
1953	1439
1954	1480
1955	1575
1956	1692
1957	1693
1958	1784
1959	1729
1960	1855
1961	1927
1962	1947
1963	1874
1964	2087
1965	2179
1966	2259
1967	2334
1968	2446
1969	2457
1970	2621
1971	2665
1972	2653
1973	2849
1974	2880
1975	2836
1976	2917
1977	2934
1978	2957
1979	2893
1980	2849
1981	2828
1982	2849
1983	2890
1984	2875
1985	2851
1986	2917
1987	2905
1988	2918
1989	2922
1990	2809
1991	2437
1992	1443
1993	1376
1994	1499
1995	1632
1996	1732
1997	1791
1998	1928
1999	1993
2000	2114
2001	2328
2002	2692
2003	3079
2004	3414
2005	3903
2006	4413
2007	5012
2008	5347
2009	4545
2010	4599
2011	4767
2012	5059
2013	5224
2014	5385
2015	5561
2016	5742
2017	5930
2018	6124