Year	Number of
1990	2465.35
1991	2596
1992	2652.93
1993	2668.59
1994	2664.19
1995	2662.84
1996	2720.52
1997	2709.3
1998	2727.76
1999	2838.36
2000	2930.13
2001	2971.95
2002	3051.22
2003	2978.85
2004	3063.89
2005	3067.67
2006	3190.87
2007	3178.47
2008	3260.96
2009	3383.46
2010	3407.93
2011	3420.86
2012	3543.28
2013	3663.59
2014	3801.35
2015	3974.06
2016	4155.18