Year	Number of
1990	1552.37
1991	1618.59
1992	1692.52
1993	1774.91
1994	1864.16
1995	1962.02
1996	2045.85
1997	2134.68
1998	2231.78
1999	2336.74
2000	2451.22
2001	2559.42
2002	2674.51
2003	2800.95
2004	2934.15
2005	3074.35
2006	3192.8
2007	3315.51
2008	3448.11
2009	3585.72
2010	3729.32
2011	3859.99
2012	3995.8
2013	4137.86
2014	4284.41
2015	4435.1
2016	4584.3