Year	Number of
1990	3686.39
1991	3836.93
1992	4000.87
1993	4200.19
1994	4370.92
1995	4569.21
1996	4721.68
1997	4861.85
1998	5021.87
1999	5234.01
2000	5375.85
2001	5532.92
2002	5702.33
2003	5866.55
2004	6021.04
2005	6170.09
2006	6334.01
2007	6503.94
2008	6705.4
2009	6934.85
2010	7186.65
2011	7441.07
2012	7704.63
2013	7959.26
2014	8170.49
2015	8247.26
2016	8389.9