Year	Number of
1990	2241.33
1991	2313.49
1992	2405.33
1993	2498.16
1994	2599.85
1995	2716.36
1996	2840.99
1997	2981.82
1998	3140.53
1999	3141.09
2000	3292.72
2001	2887.01
2002	2701.72
2003	2617.12
2004	2657.48
2005	2746.54
2006	2826.49
2007	3068.26
2008	3109.49
2009	3261.5
2010	3500.6
2011	3718.25
2012	4105.4
2013	4761.6
2014	5700.53
2015	6148.41
2016	6560.53