Year	Number of
1990	1996.05
1991	2110.56
1992	2232.1
1993	2359.54
1994	2493.62
1995	2644.38
1996	2767.65
1997	2893.44
1998	3028.68
1999	3163.23
2000	3314.52
2001	3441.64
2002	3559.07
2003	3679.25
2004	3804.95
2005	3936.24
2006	4026.59
2007	4117.27
2008	4212.93
2009	4312.68
2010	4418.77
2011	4468.21
2012	4504.91
2013	4549.19
2014	4593.2
2015	4636.97
2016	4681.69