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