Year	Number of
1990	3192.79
1991	3280.47
1992	3388.4
1993	3408.83
1994	3537.59
1995	3693.29
1996	3818.88
1997	4040.99
1998	4074.31
1999	4209.43
2000	4396.86
2001	4137.98
2002	4046.6
2003	4007.42
2004	3972.33
2005	3922.46
2006	4024.13
2007	4073.7
2008	4133.21
2009	4260.16
2010	4378.5
2011	4439.7
2012	4476.15
2013	4505.34
2014	4599.04
2015	4705.24
2016	4829.12