• 1961 to 1961 1
• 1962 to 1964 1
• 1965 to 1966 0
• 1967 to 1969 0
• 1970 to 1971 0
• 1972 to 1974 1
• 1975 to 1976 0
• 1977 to 1979 0
• 1980 to 1981 0
• 1982 to 1984 0
• 1985 to 1986 1
• 1987 to 1987 1