Year	Number of
1990	5087.67
1991	5289.02
1992	5545.42
1993	5775.99
1994	5941.63
1995	5974.61
1996	6164.61
1997	6198.01
1998	6219.33
1999	6296.03
2000	6343.01
2001	6243.76
2002	6239.39
2003	6344.36
2004	6469.73
2005	6573.39
2006	6691.58
2007	6689.45
2008	6700.53
2009	6832.11
2010	6767.86
2011	6753.9
2012	6750.96
2013	6712.74
2014	6753.16
2015	6809.08
2016	6874.45