Year	Number of
1990	4980.74
1991	5354.57
1992	5770.24
1993	6235.83
1994	6800.81
1995	7448.88
1996	7937.11
1997	8434.33
1998	8982.27
1999	9527.89
2000	10006.75
2001	10397.2
2002	10692.05
2003	10940.89
2004	11236.24
2005	11563.67
2006	11719.47
2007	11895.67
2008	12154.78
2009	12460.81
2010	12792.79
2011	13068.96
2012	13406.82
2013	13716.4
2014	14237.56
2015	14795.97
2016	15464.51