Year	Number of
1990	2584.4
1991	2665.77
1992	2749.8
1993	2834.07
1994	2917.87
1995	3010.8
1996	3116.37
1997	3228.86
1998	3350.53
1999	3481.13
2000	3621.86
2001	3710.37
2002	3807.36
2003	3919.99
2004	4055.1
2005	4209.64
2006	4332.46
2007	4464.02
2008	4605.74
2009	4762.94
2010	4936.37
2011	5103.18
2012	5275.44
2013	5453.19
2014	5642.43
2015	5831.92
2016	6023.63