Year	Number of
1990	5482.89
1991	5869.67
1992	6391.69
1993	6936.49
1994	7482.15
1995	8131.04
1996	8519.57
1997	9032.38
1998	9475.7
1999	9911.23
2000	10330.24
2001	10711.52
2002	11118.34
2003	11574.71
2004	11836.92
2005	12099.1
2006	12260.01
2007	12473.33
2008	12710.57
2009	12982.08
2010	13323.95
2011	13625.35
2012	14013.48
2013	14497.03
2014	15055.63
2015	15659.74
2016	16131.55