Year	Number of
1990	4250.42
1991	4370.1
1992	4489.33
1993	4594.68
1994	4624.78
1995	4746.84
1996	4795.84
1997	4837.22
1998	4804.65
1999	4723.98
2000	4692.62
2001	4627.75
2002	4739.2
2003	4641.06
2004	4610.66
2005	4514.76
2006	4440.82
2007	4419.9
2008	4252.17
2009	4202.31
2010	4132.7
2011	4041.33
2012	4036.54
2013	4093.95
2014	4163.68
2015	4333.58
2016	4492.85