Year	Number of
1990	4549.49
1991	4719.39
1992	4896.37
1993	5086.92
1994	5297.56
1995	5561.18
1996	5757.42
1997	5956.99
1998	6147.24
1999	6347.22
2000	6545.87
2001	6809.29
2002	7053.78
2003	7301.64
2004	7548.95
2005	7804.13
2006	7969.6
2007	8122.74
2008	8268.59
2009	8426.64
2010	8572.98
2011	8777.88
2012	8976.12
2013	9163.96
2014	9325.39
2015	9485.02
2016	9667.91