• 1984 to 1984 1
• 1985 to 1986 7
• 1987 to 1989 12
• 1990 to 1991 3
• 1992 to 1994 6
• 1995 to 1996 11
• 1997 to 1999 2
• 2000 to 2001 6
• 2002 to 2004 3
• 2005 to 2006 1
• 2007 to 2009 1
• 2010 to 2011 0
• 2012 to 2012 1