• 1958 to 1959 4
• 1960 to 1961 1
• 1962 to 1963 3
• 1964 to 1965 4
• 1966 to 1967 3
• 1968 to 1969 2
• 1970 to 1971 2
• 1972 to 1973 1
• 1974 to 1975 2
• 1976 to 1976 1