Year	Number of
1990	1546.16
1991	1632.53
1992	1725.94
1993	1827.01
1994	1937.06
1995	2056.97
1996	2191.19
1997	2336.3
1998	2494.74
1999	2662.46
2000	2839.78
2001	3015.4
2002	3201.86
2003	3411.59
2004	3639.24
2005	3889.03
2006	4152.85
2007	4440.49
2008	4761.96
2009	5110.74
2010	5488.85
2011	5803.6
2012	6139.13
2013	6492.89
2014	6871.87
2015	7280.03
2016	7709.28