• 1989 to 1989 1
• 1990 to 1991 1
• 1992 to 1994 1
• 1995 to 1996 0
• 1997 to 1999 1
• 2000 to 2001 2
• 2002 to 2004 1
• 2005 to 2006 10
• 2007 to 2009 5
• 2010 to 2011 12
• 2012 to 2014 13
• 2015 to 2016 1
• 2017 to 2017 1