Year	Number of
1990	2228.38
1991	2343.67
1992	2470.84
1993	2601.78
1994	2744.28
1995	2900.87
1996	3055.87
1997	3217.55
1998	3388.4
1999	3554.49
2000	3694.14
2001	3816.37
2002	3937.31
2003	4071.34
2004	4189.15
2005	4338.69
2006	4483.78
2007	4641.77
2008	4823.35
2009	5004.07
2010	5196.5
2011	5421.64
2012	5624.95
2013	5831.9
2014	6034.21
2015	6260.37
2016	6465.19