Year	Number of
1990	3524.6
1991	3754.32
1992	4036.62
1993	4282.02
1994	4569.57
1995	4887.32
1996	5099.58
1997	5299.24
1998	5566.89
1999	5860.45
2000	6126.33
2001	6356.53
2002	6574.46
2003	6769.78
2004	6949.36
2005	7099.71
2006	7151.86
2007	7265.02
2008	7367.99
2009	7498.91
2010	7625.86
2011	7776.35
2012	7916.94
2013	8166.85
2014	8411.26
2015	8669.11
2016	8950.15