Year	Number of
1990	2668.8
1991	2744.92
1992	2833.28
1993	2931.78
1994	3046.63
1995	3181.41
1996	3288.32
1997	3410.01
1998	3539.25
1999	3669.96
2000	3802.17
2001	3982.93
2002	4175.42
2003	4376.09
2004	4598.68
2005	4847.35
2006	5066.18
2007	5313.08
2008	5576.22
2009	5848.79
2010	6130.77
2011	6254.18
2012	6386.98
2013	6515.31
2014	6642.4
2015	6774.87
2016	6913.24