Year	Number of
1990	4498.02
1991	4615.46
1992	4737.64
1993	4868.74
1994	5006.88
1995	5157.5
1996	5302.37
1997	5455.77
1998	5623.23
1999	5807.67
2000	6004.19
2001	6097.65
2002	6197.07
2003	6302.91
2004	6424.09
2005	6557.15
2006	6662.41
2007	6781.22
2008	6906.73
2009	7036.8
2010	7155.21
2011	7354.19
2012	7573.27
2013	7798.83
2014	8033.96
2015	8263.57
2016	8496.89