Year	Number of
1990	6006.28
1991	6208.38
1992	6429.83
1993	6680.1
1994	6932.91
1995	7207.46
1996	7533.06
1997	7915.26
1998	8318.33
1999	8751.13
2000	9222.47
2001	9697.88
2002	10165.55
2003	10664.52
2004	11199.95
2005	11760.85
2006	12106.87
2007	12437.58
2008	12778.68
2009	13157.26
2010	13508.96
2011	13869.53
2012	14251.1
2013	14679.15
2014	15144.06
2015	15672.66
2016	16154.89