Year	Number of
1990	5867.32
1991	6155.87
1992	6415.26
1993	6517.84
1994	6643.42
1995	6792.31
1996	6988.8
1997	7241.66
1998	7400.1
1999	8106.11
2000	8839.63
2001	9322.3
2002	9697.37
2003	10138.43
2004	10329.29
2005	10610.5
2006	10912.14
2007	11180.76
2008	11369.76
2009	11546.95
2010	11709.44
2011	11944.35
2012	12274.2
2013	12661.59
2014	12992.61
2015	13467.22
2016	13981.32