Year	Total
1970	0
1971	0
1972	378000
1973	523000
1974	575000
1975	578000
1976	761000
1977	849000
1978	937000
1979	1078000
1980	1214000
1981	1273000
1982	1652700
1983	1839000
1984	2122700
1985	2410600
1986	2718200
1987	3193800
1988	3759100
1989	3973900
1990	4277200
1991	4404900
1992	4803400
1993	5376900
1994	5702600
1995	6304500
1996	6766600
1997	6651400
1998	7187300
1999	7836200
2000	8470000
2001	9484600
2002	9978200
2003	10733000
2004	11539000
2005	12402000
2006	13431000
2007	14341000
2008	15313000
2009	17529000
2010	18003000
2011	18311000
2012	19951000
2013	20527000
2014	21527000
2015	24175000
2016	24768000