Year	Number of
1990	3421.96
1991	3563.05
1992	3643.72
1993	3745.23
1994	3846.58
1995	3948.72
1996	4081.58
1997	4054.33
1998	4168.8
1999	4194.72
2000	4377.6
2001	4575.48
2002	4718.06
2003	4868.39
2004	5001.18
2005	5103.86
2006	5167.04
2007	5254.37
2008	5324.6
2009	5407.71
2010	5484.66
2011	5560.82
2012	5674.14
2013	5787.94
2014	5848.65
2015	5865.61
2016	6111.55