Year	Number of
1990	8280.82
1991	8797.68
1992	9352.48
1993	9945.27
1994	10567.54
1995	11242.14
1996	11816.59
1997	12411.08
1998	13028.32
1999	13640.52
2000	14305.47
2001	14882.99
2002	15475.38
2003	16108.94
2004	16750.23
2005	17431.55
2006	17949.36
2007	18468.02
2008	18997.59
2009	19509.06
2010	20050.37
2011	20298.22
2012	20491.34
2013	20694.22
2014	20903.81
2015	21114
2016	21328.78