• 1990 to 1991 1
• 1992 to 1994 2
• 1995 to 1996 0
• 1997 to 1999 5
• 2000 to 2001 6
• 2002 to 2004 13
• 2005 to 2006 8
• 2007 to 2009 13
• 2010 to 2011 12
• 2012 to 2014 3
• 2015 to 2015 1