Year	Number of
1990	35001.69
1991	36913.03
1992	38760.34
1993	40379.04
1994	41911.27
1995	43701.89
1996	45133.54
1997	46507.2
1998	47856.17
1999	49556
2000	51326.97
2001	53077.72
2002	54868.8
2003	56730.8
2004	59100.84
2005	61621.63
2006	63740.15
2007	66247.26
2008	68465.22
2009	69938.65
2010	71827.23
2011	73134.22
2012	74081.31
2013	74701.97
2014	74192.11
2015	74899.69
2016	75747.65