Year	Number of
1990	3461.57
1991	3637.76
1992	3728.98
1993	3850.52
1994	4014.17
1995	4211.67
1996	4300.69
1997	4515.56
1998	4510.56
1999	4494.37
2000	4571.67
2001	4669.33
2002	4776.51
2003	4923.48
2004	5057.75
2005	5262.55
2006	5493.7
2007	5757.71
2008	5984.99
2009	6301.05
2010	6496.78
2011	6635.39
2012	6816.72
2013	6914.03
2014	6961.04
2015	6898.35
2016	6896.2