• 1991 to 1991 1
• 1992 to 1994 8
• 1995 to 1996 7
• 1997 to 1999 7
• 2000 to 2001 1
• 2002 to 2004 1
• 2005 to 2006 1
• 2007 to 2009 0
• 2010 to 2011 0
• 2012 to 2013 2