Year	Number of
1990	3261.48
1991	3330.66
1992	3425.88
1993	3543.41
1994	3663.25
1995	3779.38
1996	3854.77
1997	3887.12
1998	3901.43
1999	3953.6
2000	4033.5
2001	4093.07
2002	4167.77
2003	4237.62
2004	4304.89
2005	4356.02
2006	4390.3
2007	4403.08
2008	4447.76
2009	4503.84
2010	4568.65
2011	4509.92
2012	4472.06
2013	4402.57
2014	4366.31
2015	4270.53
2016	4167.98