Year	Number of
1990	2428.65
1991	2581.48
1992	2746.43
1993	2925.59
1994	3127.81
1995	3355.78
1996	3531.56
1997	3713.34
1998	3904.81
1999	4119.65
2000	4358.07
2001	4504.22
2002	4652.01
2003	4797.98
2004	4959.8
2005	5132.14
2006	5314.83
2007	5490.09
2008	5663.28
2009	5845.89
2010	6037.7
2011	6263.86
2012	6501.4
2013	6746.03
2014	7019
2015	7307.33
2016	7614.68