Year	Number
1981	204326
1986	209216
1989	207448
1990	203731
1991	197066
1992	192673
1993	191565
1994	195686
1995	198470
1996	197735
1997	196148
1998	213364
1999	220314
2000	226513
2001	234184
2002	238066
2003	236949
2004	235289
2005	231474
2006	220026
2007	158822
2008	147164
2009	122330
2010	112603
2011	102913
2012	93230
2013	98502
2014	94676
2015	92547
2016	93146
2017	93459