Year	Number of
1990	3429.71
1991	3562.41
1992	3708.03
1993	3867.35
1994	4042.13
1995	4237.42
1996	4412.44
1997	4607.81
1998	4820.48
1999	5042.13
2000	5271.43
2001	5488.71
2002	5702.55
2003	5920.36
2004	6150.1
2005	6397.6
2006	6627.19
2007	6873.42
2008	7139.57
2009	7416
2010	7703.72
2011	7998.55
2012	8313.13
2013	8643.98
2014	8990.97
2015	9353.63
2016	9717.93