Year	Number of
1990	2238.77
1991	2304.64
1992	2420.24
1993	2538.7
1994	2655.82
1995	2787.92
1996	2822.05
1997	2965.71
1998	3084.33
1999	3211.68
2000	3360.79
2001	3399.81
2002	3454.9
2003	3528.88
2004	3558.87
2005	3590.24
2006	3600.4
2007	3642.57
2008	3690.13
2009	3748.85
2010	3810.35
2011	3857.17
2012	3920.63
2013	3995.37
2014	4075.82
2015	4162.84
2016	4249.69