Year	Number of
1990	1966.99
1991	2134.01
1992	2286
1993	2432.73
1994	2591.58
1995	2764.9
1996	2845.42
1997	2935.73
1998	3030.88
1999	3127.72
2000	3233.78
2001	3252.15
2002	3273.35
2003	3299.3
2004	3329.51
2005	3370.14
2006	3424.22
2007	3475.68
2008	3525.33
2009	3576.67
2010	3636.55
2011	3796.3
2012	3965.96
2013	4146.76
2014	4324.8
2015	4506.85
2016	4694.59