Year	Number of
1990	4515.49
1991	4728.46
1992	4945.51
1993	5227.26
1994	5453.61
1995	5693.61
1996	5924.02
1997	6144.36
1998	6439.28
1999	6710.75
2000	6881.72
2001	7115.83
2002	7355.3
2003	7597.53
2004	7781.17
2005	7975.04
2006	8122.61
2007	8343.97
2008	8500.52
2009	8665.06
2010	8809.44
2011	8977.7
2012	9173.25
2013	9137.81
2014	9139.15
2015	9185.87
2016	9285.21