Year	Number of
1990	3497.89
1991	3487.2
1992	3507.27
1993	3551.93
1994	3642.16
1995	3795.16
1996	3865.9
1997	3901.32
1998	3894.55
1999	3910.79
2000	3918.36
2001	3894.64
2002	3889.43
2003	3874.96
2004	3833.55
2005	3776.86
2006	3717.61
2007	3682.8
2008	3659.74
2009	3637.96
2010	3615.38
2011	3560.87
2012	3527.97
2013	3533.63
2014	3572.36
2015	3621.57
2016	3674.46