Year	Number of
1990	3012.63
1991	3104.65
1992	3209.81
1993	3316.76
1994	3423.58
1995	3524.64
1996	3635.83
1997	3736.67
1998	3834.63
1999	3930.34
2000	4031.38
2001	4065.52
2002	4108.68
2003	4170.76
2004	4239.38
2005	4313.2
2006	4357.27
2007	4408.91
2008	4466.88
2009	4531.33
2010	4601.89
2011	4605.19
2012	4611.09
2013	4618.36
2014	4631.44
2015	4651.14
2016	4660.55