Year	Total
1985	11460000
1986	11077000
1987	10181000
1988	9692300
1989	9040700
1990	8063300
1991	7004500
1992	6434400
1993	5538500
1994	5212700
1995	5375600
1996	5131000
1997	4886600
1998	4560600
1999	4886600
2000	4607200
2001	4517000
2002	4189000
2003	4176400
2004	4068800
2005	4668700
2006	5508700
2007	8822500
2008	13306000
2009	13295000
2010	13580000
2011	13326000
2012	14043000
2013	14575000
2014	15807000
2015	16151000
2016	15716000