Year	Number of
1990	4548.58
1991	4777.57
1992	5017.59
1993	5268.29
1994	5559.55
1995	5870.3
1996	6206.15
1997	6541.7
1998	6913.03
1999	7242.99
2000	7577.96
2001	7901.21
2002	8239.96
2003	8575.26
2004	8933.24
2005	9320.89
2006	9645.1
2007	9995.15
2008	10325.44
2009	10608.21
2010	10978.33
2011	11324.14
2012	11660.58
2013	11975.98
2014	12247.82
2015	12615.24
2016	12994.89