Year	Number of
1990	2467.69
1991	2600.92
1992	2811.71
1993	3006.84
1994	3205.25
1995	3385.65
1996	3554.92
1997	3787.72
1998	4011.02
1999	4328.86
2000	4565.16
2001	4826.56
2002	5104.7
2003	5366.01
2004	5562.7
2005	5792.36
2006	6093.54
2007	6369.04
2008	6670.43
2009	6973.67
2010	7297.63
2011	7518.66
2012	7730.86
2013	7805.9
2014	7921.16
2015	8028.12
2016	8111.67