Year	Number of
1990	7081.2
1991	7161.27
1992	7280.57
1993	7448.64
1994	7719.17
1995	7956.13
1996	7974.65
1997	8040.76
1998	8084.17
1999	8272.95
2000	8420.51
2001	8333
2002	8228.14
2003	8173.95
2004	8178.18
2005	8247.54
2006	8247.57
2007	8267.02
2008	8246.47
2009	8381.16
2010	8603.49
2011	8772.98
2012	8932.14
2013	9066.96
2014	9222.32
2015	9367.98
2016	9547.66