Year	Number of
1990	6375.94
1991	6573.8
1992	6800.41
1993	7010.89
1994	7246.48
1995	7482.86
1996	7805.8
1997	8163.46
1998	8498.12
1999	8865.8
2000	9278.53
2001	9737.69
2002	10217.25
2003	10746.79
2004	11320.96
2005	12007.17
2006	12345.93
2007	12816.39
2008	13283.1
2009	13917.28
2010	14592.61
2011	15290.96
2012	15976.5
2013	16806.36
2014	17654.89
2015	18449.72
2016	19190.57