Year	Number of
1990	7278.01
1991	7543.75
1992	7824.24
1993	8122.64
1994	8438.54
1995	8779.64
1996	9190.84
1997	9630.15
1998	10102.15
1999	10604.18
2000	11146.01
2001	11595.99
2002	12074.81
2003	12588.37
2004	13133.41
2005	13721.55
2006	14255.09
2007	14812.33
2008	15422.78
2009	16072.16
2010	16772.08
2011	17364.89
2012	17993.46
2013	18649.02
2014	19336.63
2015	20059.3
2016	20826.58