Year	Number of
1990	2968.75
1991	3054.84
1992	3147.26
1993	3249.2
1994	3356.53
1995	3469.06
1996	3590.72
1997	3719.52
1998	3860.93
1999	4008.25
2000	4161.44
2001	4268.75
2002	4377.84
2003	4497.46
2004	4621.56
2005	4751.16
2006	4860.31
2007	4975.1
2008	5095.42
2009	5223.27
2010	5359.56
2011	5486.88
2012	5620.5
2013	5749.02
2014	5885.92
2015	6031.44
2016	6170.96