Year	Number of
1990	3393.54
1991	3495.79
1992	3601.91
1993	3716.96
1994	3841.56
1995	3978.67
1996	4131.46
1997	4299.38
1998	4483.96
1999	4672.13
2000	4863.05
2001	5068
2002	5274.1
2003	5497.93
2004	5741.5
2005	6009.82
2006	6268.11
2007	6548.82
2008	6861.21
2009	7184.99
2010	7520.17
2011	7775.89
2012	8047.75
2013	8340.63
2014	8659.19
2015	9005.19
2016	9338.87