Year	Total
1985	20700000
1986	18869000
1987	18250000
1988	18335000
1989	18720000
1990	21554000
1991	21748000
1992	20330000
1993	15730000
1994	12321000
1995	11975000
1996	10184000
1997	10225000
1998	8505300
1999	7013400
2000	7066000
2001	7671000
2002	8295000
2003	8901000
2004	9110600
2005	9330800
2006	10651000
2007	11595000
2008	11478000
2009	9287600
2010	9873800
2011	11536000
2012	11531000
2013	12081000
2014	12295000
2015	13183000
2016	13195000