Year	Number of
1990	4701.49
1991	4811.57
1992	4917.86
1993	5027.97
1994	5111.16
1995	5156.08
1996	5231.33
1997	5268.74
1998	5276.28
1999	5262.69
2000	5254.53
2001	5280.5
2002	5336.51
2003	5384.94
2004	5370.25
2005	5355.37
2006	5348.7
2007	5391.77
2008	5411.34
2009	5435.61
2010	5479.52
2011	5522.38
2012	5595.64
2013	5707.43
2014	5817.93
2015	5959.59
2016	6037.1