• 1984 to 1984 1
• 1985 to 1986 0
• 1987 to 1989 0
• 1990 to 1991 0
• 1992 to 1994 1
• 1995 to 1996 0
• 1997 to 1999 0
• 2000 to 2001 1
• 2002 to 2004 4
• 2005 to 2006 0
• 2007 to 2009 1
• 2010 to 2011 3