1992 6,800

1993 7,026

1994 7,398

1995 7,701

1996 7,991

1997 8,408

1998 8,714

1999 9,173

2000 9,509

2001 9,778

2002 10,133

2003 10,416

2004 10,862

2005 11,290

2006 11,894

2007 12,675

2008 13,094

2009 11,942

2010 12,002

2011 12,056

2012 11,708

2013 11,572