Year	Number of
1990	4248.17
1991	4461.4
1992	4680.96
1993	4904.72
1994	5147.59
1995	5414.31
1996	5708.61
1997	6022.08
1998	6359.33
1999	6718.77
2000	7104.9
2001	7411.33
2002	7719
2003	8045.25
2004	8380.84
2005	8744.21
2006	9211.61
2007	9676.11
2008	10131.34
2009	10583.64
2010	11059.63
2011	11729.8
2012	12454.2
2013	13153.59
2014	13910.34
2015	14735.78
2016	15731.88