Year	Number of
1990	5917.39
1991	6185.83
1992	6493.51
1993	6863.74
1994	7281.51
1995	7734.52
1996	8139.9
1997	8823.64
1998	9404.13
1999	10032.78
2000	10733.29
2001	10904.24
2002	11153.26
2003	11359.3
2004	11570.06
2005	11786.89
2006	11888.49
2007	11987.89
2008	12103.83
2009	12263.85
2010	12442.17
2011	12692.1
2012	12997.25
2013	13361.13
2014	13742.97
2015	14188.23
2016	14617.11