Year	Number of
1990	4679.13
1991	4929.42
1992	5186.78
1993	5487.09
1994	5748.8
1995	6016.97
1996	6234.11
1997	6413.72
1998	6645.89
1999	6812.09
2000	7002.6
2001	7195.54
2002	7431.79
2003	7659.5
2004	7939.8
2005	8225.73
2006	8473.95
2007	8530.68
2008	8644.92
2009	8750.99
2010	8888.53
2011	9009.05
2012	9166.92
2013	9299.25
2014	9459.34
2015	9659.87
2016	9786.12