Year	Number of
1990	327.36
1991	343.29
1992	359.72
1993	378.25
1994	395.19
1995	413.22
1996	429.63
1997	446.4
1998	465.89
1999	485.48
2000	504.44
2001	523.69
2002	542.51
2003	566.39
2004	591.36
2005	618.55
2006	638.44
2007	658.98
2008	681.1
2009	706.7
2010	736.68
2011	764.87
2012	795.86
2013	826.47
2014	859.39
2015	894.08
2016	933.31