Year	Number of
1990	3444.11
1991	3555.21
1992	3614.17
1993	3695.92
1994	3780.11
1995	3875.83
1996	3994.63
1997	3973.37
1998	4074.42
1999	4087.75
2000	4242.55
2001	4427
2002	4570.17
2003	4705.49
2004	4826.59
2005	4943.28
2006	5022.24
2007	5127.83
2008	5210.31
2009	5306.2
2010	5403.91
2011	5500.72
2012	5622.53
2013	5744.81
2014	5833.87
2015	5902.46
2016	6174.37