Year	Number of
1990	183761.33
1991	185619.6
1992	191100.54
1993	198004.38
1994	206713.03
1995	211453.46
1996	219991.2
1997	229487.88
1998	238973.92
1999	251036.79
2000	264408.37
2001	280266.28
2002	297188.31
2003	304600.04
2004	317197.41
2005	333356.94
2006	335858.12
2007	343424.24
2008	354359.97
2009	369277.58
2010	384666.97
2011	388842.85
2012	395093.89
2013	404265.85
2014	417064.65
2015	421352.79
2016	423747.32