Year	Number of
1990	12514.14
1991	12401.53
1992	12176.67
1993	12041.68
1994	11766.38
1995	11604.03
1996	11435.04
1997	11245.62
1998	11327.48
1999	11198.26
2000	11021.6
2001	10890.21
2002	10877.71
2003	10777.19
2004	10785.46
2005	10833.89
2006	10826.81
2007	10981.22
2008	11033.72
2009	11148.38
2010	11295.91
2011	11506.06
2012	11802.5
2013	12036.88
2014	12242.37
2015	12686.52
2016	13153.4