Year	Number of
1990	2986.82
1991	3222.04
1992	3465.76
1993	3711.28
1994	3975.42
1995	4256.59
1996	4537.01
1997	4786.65
1998	5070.15
1999	5229.97
2000	5314.45
2001	5367.65
2002	5427.89
2003	5492.74
2004	5595.82
2005	5682.01
2006	5737.63
2007	5784.49
2008	5820.99
2009	5874.68
2010	5961.52
2011	6047.32
2012	6120.87
2013	6207.47
2014	6326.89
2015	6486.44
2016	6688.05