• 1990 to 1991 1
• 1992 to 1993 0
• 1994 to 1995 1
• 1996 to 1997 0
• 1998 to 1999 0
• 2000 to 2001 0
• 2002 to 2003 2
• 2004 to 2005 1
• 2006 to 2007 2
• 2008 to 2009 4
• 2010 to 2010 1