Year	Number of
1990	2839.39
1991	2967.59
1992	3106.12
1993	3240.61
1994	3353.26
1995	3498.86
1996	3596.89
1997	3678.8
1998	3711.92
1999	3632.28
2000	3580.39
2001	3505.78
2002	3505.21
2003	3452.83
2004	3432.82
2005	3387.05
2006	3359.03
2007	3374.81
2008	3310.11
2009	3320.32
2010	3315.8
2011	3329.23
2012	3376.33
2013	3468.85
2014	3560.91
2015	3708.04
2016	3843.6