Year	Number of
1990	2798.6
1991	2962.84
1992	3163.84
1993	3359.19
1994	3597.98
1995	3862.52
1996	4110.46
1997	4327.71
1998	4566.64
1999	4751.66
2000	4907.96
2001	5039.71
2002	5123.11
2003	5243.48
2004	5432.63
2005	5610.78
2006	5636.9
2007	5713.96
2008	5761.53
2009	5814.96
2010	5929.13
2011	6047.17
2012	6122.8
2013	6202.92
2014	6322.08
2015	6429.05
2016	6518.63