Year	Number
1986	5339728
1987	4302156
1988	3258184
1989	2792975
1990	2867863
1991	2885864
1992	3255326
1993	3796142
1994	4813004
1995	6229321
1996	7358602
1997	8535316
1998	6839728
1999	4489965
2000	4179665
2001	3789902
2002	3453140
2003	2866756
2004	3183250
2005	3000596
2006	3976604
2007	3268196
2008	2424776
2009	2656745
2010	2798213
2011	2571539
2012	2319502
2013	2402345
2014	2372699
2015	2329258
2016	2252122
2017	2167502
2018	2310029