Year	Number of
1990	3884.43
1991	4029.24
1992	4166.97
1993	4302.26
1994	4440.17
1995	4579.25
1996	4652.74
1997	4729.17
1998	4810.7
1999	4899.01
2000	4989.78
2001	5080.16
2002	5175.87
2003	5286.21
2004	5407.9
2005	5540.74
2006	5629.9
2007	5725.01
2008	5830.94
2009	5937.49
2010	6045.43
2011	6118.93
2012	6190.23
2013	6264.15
2014	6338.37
2015	6413.83
2016	6475.03