Year	Number of
1990	2661.42
1991	2644.7
1992	2726.38
1993	2806.72
1994	2894.27
1995	3045.32
1996	3125.58
1997	3165.23
1998	3244.22
1999	3253.43
2000	3415.32
2001	3387.08
2002	3405.82
2003	3463.43
2004	3455.34
2005	3490.09
2006	3703.27
2007	3690.14
2008	3688.71
2009	3695.92
2010	3815.25
2011	3977.75
2012	4135.18
2013	4278.27
2014	4350.26
2015	4180.21
2016	4365.44