Year	Number of
1990	9192.09
1991	9481.55
1992	9827.46
1993	10127.81
1994	10498.2
1995	10864.14
1996	11197.04
1997	11572.42
1998	11951.45
1999	12366.49
2000	12704.92
2001	12960.23
2002	13244.41
2003	13657.84
2004	14036.9
2005	14333.36
2006	14475.61
2007	14663.77
2008	14838
2009	14995.51
2010	15192.77
2011	15441.88
2012	15698.84
2013	16091.36
2014	16473.72
2015	16959
2016	17440.44