Year	Measure
1800	510.5
1820	514.6
1885	743.4
1886	714.2
1887	834.6
1888	802.3
1889	745.6
1890	742
1891	679.2
1892	743.1
1893	841.5
1894	956.2
1895	884.3
1896	973.3
1897	956.4
1898	981.2
1899	1040
1900	1017
1901	1042
1902	1132
1903	1053
1904	1164
1905	1029
1906	983.1
1907	944.1
1908	1030
1909	1069
1910	1140
1911	1053
1912	1136
1913	1193
1914	1139
1915	1171
1916	1040
1917	913
1918	558.6
1919	481.2
1920	482.9
1921	441.7
1922	512.4
1923	589.8
1924	746.7
1925	932.5
1926	1046
1927	1089
1928	1145
1929	1157
1930	1209
1931	1219
1932	1199
1933	1244
1934	1357
1935	1550
1936	1655
1937	1791
1938	1785
1939	1856
1940	1777
1946	1580
1947	1755
1948	1981
1949	2162
1950	2341
1951	2310
1952	2416
1953	2477
1954	2552
1955	2720
1956	2926
1957	2932
1958	3095
1959	3005
1960	3229
1961	3353
1962	3388
1963	3261
1964	3633
1965	3792
1966	3931
1967	4061
1968	4257
1969	4276
1970	4562
1971	4638
1972	4618
1973	4959
1974	5110
1975	5133
1976	5383
1977	5521
1978	5672
1979	5660
1980	5683
1981	5751
1982	5908
1983	6112
1984	6200
1985	6268
1986	6540
1987	6641
1988	6802
1989	6946
1990	6808
1991	6693
1992	6014
1993	5528
1994	4869
1995	4356
1996	4475
1997	4988
1998	5412
1999	5602
2000	5936
2001	6225
2002	6546
2003	7000
2004	7807
2005	8541
2006	9431
2007	10270
2008	11530
2009	11570
2010	12490
2011	13250
2012	13520
2013	13870
2014	14310
2015	14800
2016	15330
2017	15920
2018	16570