Year	Number of
1990	4873.63
1991	5146.31
1992	5433.62
1993	5748.51
1994	6028.81
1995	6359.12
1996	6640.63
1997	6878.72
1998	7185.94
1999	7470.49
2000	7777.64
2001	8067.79
2002	8408.88
2003	8730.48
2004	9166.73
2005	9555.76
2006	9830.55
2007	9861.19
2008	10058.51
2009	10314.95
2010	10630.28
2011	10897.99
2012	11180.95
2013	11463.8
2014	11769.21
2015	12114.5
2016	12418.61