• 1991 to 1991 2
• 1992 to 1994 17
• 1995 to 1996 4
• 1997 to 1999 10
• 2000 to 2001 7
• 2002 to 2004 5
• 2005 to 2006 4
• 2007 to 2009 11
• 2010 to 2011 4
• 2012 to 2014 4