Year	Number of
1990	3095.6
1991	3257.68
1992	3435.12
1993	3629.58
1994	3842.42
1995	4078.08
1996	4218.71
1997	4371.72
1998	4538.81
1999	4716.44
2000	4905.9
2001	5000.8
2002	5103.95
2003	5216.05
2004	5333.48
2005	5456.5
2006	5622.98
2007	5798.55
2008	5988.32
2009	6191.35
2010	6410.18
2011	6737.43
2012	7091.48
2013	7473.99
2014	7889.58
2015	8340.5
2016	8823.74