Year	Number of
1990	3987.26
1991	4170.66
1992	4365.55
1993	4580.05
1994	4817.82
1995	5089.01
1996	5314.93
1997	5554.21
1998	5811.17
1999	6075.12
2000	6359.84
2001	6665.88
2002	7005.21
2003	7346.92
2004	7708.24
2005	8097.83
2006	8556.4
2007	9053.85
2008	9580.69
2009	10132.41
2010	10731.57
2011	11126.96
2012	11570.62
2013	12032
2014	12526.39
2015	13031.76
2016	13553.87