Year	Number of
1990	5242.1
1991	5599.5
1992	5990.84
1993	6419.99
1994	6895.73
1995	7425.85
1996	7872.97
1997	8358.49
1998	8893.02
1999	9453.03
2000	10042.03
2001	10559.33
2002	11106.54
2003	11743.37
2004	12433.19
2005	13194.03
2006	13907.46
2007	14673.83
2008	15549.08
2009	16494.79
2010	17523.7
2011	18585.15
2012	19731.53
2013	20941.69
2014	22248.06
2015	23667.97
2016	25183.3