Year	Number of
1990	2577.61
1991	2641.64
1992	2741.46
1993	2833.93
1994	2918.52
1995	3006.85
1996	3095.32
1997	3198.04
1998	3332.35
1999	3384.13
2000	3452.08
2001	3506.09
2002	3645.23
2003	3782.42
2004	3860.48
2005	4041.15
2006	4135.21
2007	4243.96
2008	4543.93
2009	4719.23
2010	4898.09
2011	5028.26
2012	5213.15
2013	5536.05
2014	5759.58
2015	5989.49
2016	6280.5