• 1952 to 1954 3
• 1955 to 1959 4
• 1960 to 1964 4
• 1965 to 1969 0
• 1970 to 1974 3
• 1975 to 1979 3
• 1980 to 1984 1
• 1985 to 1989 0
• 1990 to 1994 2
• 1995 to 1999 0
• 2000 to 2004 0
• 2005 to 2009 2
• 2010 to 2014 4
• 2015 to 2015 1