Year	Number of
1990	3453.11
1991	3431.07
1992	3414.36
1993	3379.59
1994	3380.18
1995	3412.3
1996	3421.45
1997	3352.38
1998	3345.64
1999	3331.07
2000	3319.39
2001	3325.68
2002	3382.89
2003	3421.08
2004	3434.73
2005	3416.07
2006	3400
2007	3434.37
2008	3417.1
2009	3397.38
2010	3370.62
2011	3349.47
2012	3373.68
2013	3389.04
2014	3387.94
2015	3412.23
2016	3454.85