Year	Number
1970	362032.8
1971	387934.3
1972	388139.3
1973	457458.5
1974	482646.3
1975	494085.1
1976	513129.1
1977	535178.5
1978	573663.2
1979	626642.1
1980	673704.1
1981	757585.8
1982	805536.7
1983	856546.3
1984	889092.4
1985	922568.6
1986	858488.9
1987	873226.1
1988	862242.3
1989	846893.9
1990	785472
1991	741231.8
1992	721739.6
1993	711970.6
1994	719303.6
1995	691238.9
1996	720491.6
1997	761264.6
1998	798460.5
1999	842065.8
2000	900309.4
2001	926642.9
2002	938772.6
2003	1033511
2004	1174739
2005	1411874
2006	1610060
2007	1842522
2008	1997035
2009	2206550
2010	2337275
2011	2461866
2012	2574039
2013	2558378
2014	2513976
2015	2404152
2016	2375200
2017	2390357
2018	2214384