Year	Number of
1990	1274.64
1991	1342.29
1992	1412.13
1993	1467.5
1994	1516.38
1995	1601.63
1996	1684.14
1997	1752.54
1998	1844.19
1999	1965.23
2000	2057.18
2001	2140.96
2002	2233.38
2003	2327.77
2004	2399.23
2005	2486.58
2006	2593.39
2007	2691.91
2008	2777.56
2009	2898.38
2010	3014.69
2011	3099.97
2012	3176.86
2013	3304.88
2014	3426.28
2015	3549.05
2016	3678.72