Year	Number of
1990	3846.76
1991	3798.32
1992	3723.45
1993	3682.06
1994	3624.64
1995	3573.26
1996	3487.81
1997	3428.06
1998	3362.29
1999	3355.31
2000	3331.57
2001	3327.01
2002	3338.62
2003	3382.62
2004	3393.78
2005	3442.73
2006	3486.93
2007	3559.34
2008	3608.04
2009	3637.41
2010	3685.6
2011	3747.46
2012	3815.45
2013	3834.63
2014	3870.5
2015	3969.05
2016	4077.22