Year	Number of
1990	3171.54
1991	3276.21
1992	3369.3
1993	3525.91
1994	3625.78
1995	3816.55
1996	4023.34
1997	4198.57
1998	4423.37
1999	4681.79
2000	4931.82
2001	5208.41
2002	5513.83
2003	5796.81
2004	6138.8
2005	6499.97
2006	6832.17
2007	7188.26
2008	7586.1
2009	7984.98
2010	8435.05
2011	8606.57
2012	8774.53
2013	8781.05
2014	8562.3
2015	8496.64
2016	8445.26