Year	Number of
1990	4339.32
1991	4364.69
1992	4465.95
1993	4531.77
1994	4616.32
1995	4723.5
1996	4839.1
1997	4955.65
1998	5044.6
1999	5175.22
2000	5291.3
2001	5345.15
2002	5451
2003	5593.64
2004	5723.39
2005	5821.95
2006	5927.76
2007	6016.85
2008	6080.41
2009	6170.93
2010	6336.71
2011	6461.68
2012	6608.8
2013	6762.64
2014	6945.99
2015	7166.2
2016	7414.4