Year	Measure
1800	477.2
1820	478.1
1885	678
1886	651.2
1887	760.7
1888	731.1
1889	679.2
1890	675.7
1891	618.4
1892	676.3
1893	765.7
1894	869.8
1895	804.1
1896	884.8
1897	869.2
1898	891.4
1899	945.1
1900	923.9
1901	946
1902	1027
1903	955.3
1904	1055
1905	933.3
1906	891.2
1907	855.5
1908	933.4
1909	968.2
1910	1032
1911	952.7
1912	1028
1913	1079
1914	1030
1915	1059
1916	940.5
1917	825
1918	504.6
1919	434.6
1920	435.9
1921	398.7
1922	462.3
1923	532
1924	673.3
1925	840.7
1926	943
1927	981.4
1928	1031
1929	1042
1930	1088
1931	1097
1932	1079
1933	1119
1934	1220
1935	1394
1936	1487
1937	1609
1938	1603
1939	1666
1940	1595
1946	1416
1947	1572
1948	1774
1949	1936
1950	2095
1951	2067
1952	2161
1953	2215
1954	2281
1955	2431
1956	2615
1957	2619
1958	2764
1959	2682
1960	2882
1961	2993
1962	3024
1963	2911
1964	3242
1965	3384
1966	3508
1967	3625
1968	3799
1969	3816
1970	4072
1971	4139
1972	4121
1973	4425
1974	4488
1975	4437
1976	4579
1977	4622
1978	4673
1979	4589
1980	4535
1981	4516
1982	4566
1983	4649
1984	4641
1985	4618
1986	4741
1987	4738
1988	4776
1989	4799
1990	4629
1991	4529
1992	3456
1993	2628
1994	2089
1995	1829
1996	1843
1997	1943
1998	2132
1999	2286
2000	2533
2001	2776
2002	3059
2003	3388
2004	3760
2005	4648
2006	6174
2007	7617
2008	8331
2009	8985
2010	9326
2011	9218
2012	9291
2013	9599
2014	10080
2015	10480
2016	10750
2017	11010
2018	11360