Year	Number of
1990	5441.97
1991	5677.42
1992	5891.06
1993	6013.76
1994	6170.73
1995	6349.69
1996	6564.13
1997	6812.85
1998	6942.69
1999	7533.24
2000	8177.6
2001	8590.09
2002	8930.19
2003	9316.56
2004	9464.15
2005	9695.53
2006	9912.1
2007	10129.45
2008	10327.25
2009	10549.56
2010	10792.88
2011	11076.82
2012	11419.2
2013	11786.63
2014	12115.88
2015	12564.79
2016	13038.71