Year	Measure
1800	784.5
1820	784.5
1870	2515
1871	2512
1872	3036
1873	3000
1874	2670
1875	2240
1876	2427
1877	2448
1878	2592
1879	2248
1880	2401
1881	2228
1882	2399
1883	2764
1884	2681
1885	2963
1886	3008
1887	2615
1888	3135
1889	2786
1890	2477
1891	2642
1892	2646
1893	2811
1894	3065
1895	2962
1896	3050
1897	2876
1898	2595
1899	2608
1900	2559
1901	2576
1902	2967
1903	3016
1904	3045
1905	2692
1906	2922
1907	3180
1908	3429
1909	3410
1910	3617
1911	3410
1912	4046
1913	3818
1914	3061
1915	2849
1916	2893
1917	3134
1918	3261
1919	3616
1920	3084
1921	3173
1922	3550
1923	3656
1924	3918
1925	3677
1926	3919
1927	4380
1928	4505
1929	4438
1930	4961
1931	4037
1932	3686
1933	3172
1934	3715
1935	3870
1936	3989
1937	3993
1938	4240
1939	4258
1940	4222
1941	4247
1942	3850
1943	3842
1944	4273
1945	4341
1946	4709
1947	4974
1948	5081
1949	5194
1950	5374
1951	5715
1952	5717
1953	5927
1954	6218
1955	6172
1956	6182
1957	6151
1958	6231
1959	5605
1960	5721
1961	5809
1962	5603
1963	5559
1964	5603
1965	5605
1966	5737
1967	5445
1968	5475
1969	5756
1970	5979
1971	5917
1972	5703
1973	5737
1974	5909
1975	6253
1976	6469
1977	6504
1978	6809
1979	7190
1980	7586
1981	7691
1982	6920
1983	6475
1984	6366
1985	6420
1986	6947
1987	7452
1988	7407
1989	7453
1990	7466
1991	7629
1992	8137
1993	8332
1994	8728
1995	8495
1996	8857
1997	9230
1998	9590
1999	9267
2000	9092
2001	8732
2002	7727
2003	7854
2004	8735
2005	9266
2006	9620
2007	10220
2008	10920
2009	11150
2010	12100
2011	12740
2012	13180
2013	13630
2014	14130
2015	14650
2016	15180
2017	15730
2018	16300