Year	Number of
1990	1963.94
1991	2074.36
1992	2188.1
1993	2305.86
1994	2433.04
1995	2573.35
1996	2708.1
1997	2857.39
1998	3029.53
1999	3213.82
2000	3408.69
2001	3549.81
2002	3697.67
2003	3864.68
2004	4033.26
2005	4203.65
2006	4295.18
2007	4382.43
2008	4485.85
2009	4594.17
2010	4710.7
2011	4880.61
2012	5062.07
2013	5256.43
2014	5455.44
2015	5657.31
2016	5862.64