Year	Number of
1990	3530.31
1991	3720.22
1992	3798.78
1993	3905.64
1994	4064.54
1995	4260.25
1996	4350.7
1997	4585.73
1998	4603.98
1999	4626.03
2000	4710.14
2001	4810.09
2002	4915.03
2003	5063.7
2004	5202.39
2005	5417.43
2006	5662.16
2007	5933.01
2008	6150.11
2009	6462.43
2010	6597.38
2011	6741.28
2012	6932.81
2013	7021.12
2014	7045.15
2015	6955.56
2016	6933.59