Year	Number of
1990	24966.49
1991	26016.76
1992	27089.24
1993	28209.86
1994	29394.64
1995	30756.96
1996	32317.09
1997	33952.13
1998	35672.77
1999	37451.21
2000	39221.61
2001	40170.63
2002	41201.86
2003	42334.84
2004	43586.33
2005	44991.11
2006	45003.55
2007	45089.94
2008	45206.59
2009	45299.07
2010	45456.25
2011	46622.77
2012	47856.57
2013	49092.75
2014	50401.72
2015	51773.15
2016	53183.7