Year	Number of
1990	2470.93
1991	2583.98
1992	2715.22
1993	2861.48
1994	3021.67
1995	3209.33
1996	3388.55
1997	3584.72
1998	3798.61
1999	4035.14
2000	4302.76
2001	4548.84
2002	4823.12
2003	5123.93
2004	5452.37
2005	5816.24
2006	6047.68
2007	6295.18
2008	6565.7
2009	6852.6
2010	7161.77
2011	7351.38
2012	7547.55
2013	7747.74
2014	7966.38
2015	8208.74
2016	8426.56