Year	Total
1981	66961
1982	241350
1983	584990
1984	1062000
1985	2010100
1986	1974700
1987	1814600
1988	2079100
1989	2048100
1990	2439500
1991	2823400
1992	3302400
1993	3393700
1994	3416500
1995	3320600
1996	3776300
1997	4290000
1998	4461800
1999	4859200
2000	6794800
2001	7389800
2002	8125200
2003	9589600
2004	9382400
2005	11492000
2006	12555000
2007	13218000
2008	13978000
2009	14510000
2010	14890000
2011	15352000
2012	16648000
2013	16465000
2014	16243000
2015	16989000
2016	17587000