Year	Number of
1990	2499.62
1991	2564.74
1992	2608.34
1993	2642.16
1994	2668.22
1995	2671.39
1996	2771.39
1997	2804.12
1998	2846.66
1999	2855.69
2000	2858.14
2001	2880.39
2002	2880.36
2003	2867.08
2004	2906.49
2005	2957.71
2006	3015.76
2007	3054.48
2008	3098.14
2009	3151.45
2010	3205.94
2011	3273.43
2012	3329.46
2013	3409.73
2014	3513.24
2015	3644.87
2016	3748.13