Year	Number of
1990	1728.36
1991	1907.83
1992	2324.64
1993	2580.41
1994	2810.65
1995	3035.39
1996	3292.12
1997	3533.5
1998	3843.34
1999	4278.76
2000	4483.49
2001	4699.98
2002	4851.14
2003	4938.86
2004	4839.56
2005	4969.74
2006	5458.13
2007	5804.95
2008	6104.63
2009	6373.77
2010	6620.86
2011	6795.21
2012	6859.36
2013	6845.76
2014	6860.51
2015	6870.49
2016	6880.25