Year	Number of
1990	3640.11
1991	3849.72
1992	4081.19
1993	4336.61
1994	4621.42
1995	4944.3
1996	5182.09
1997	5444.52
1998	5727.81
1999	6032.22
2000	6362.62
2001	6741.67
2002	7159.91
2003	7616.36
2004	8109.83
2005	8651.06
2006	8909.51
2007	9170.82
2008	9383.33
2009	9703.98
2010	10038.02
2011	10516.47
2012	11040.83
2013	11591.1
2014	12156.93
2015	12736.44
2016	13340.02