Year	Number of
1990	577.65
1991	657.5
1992	750.03
1993	853.2
1994	969.8
1995	1103.28
1996	1254.49
1997	1430.55
1998	1635.88
1999	1871.71
2000	2141.21
2001	2226.51
2002	2319.24
2003	2418.55
2004	2526.87
2005	2643.1
2006	2731.31
2007	2826.99
2008	2927.23
2009	3035.77
2010	3151.3
2011	3299.37
2012	3457.24
2013	3623.46
2014	3798.63
2015	3975.74
2016	4160.98