• 1950 to 1951 3
• 1952 to 1954 2
• 1955 to 1956 1
• 1957 to 1959 2
• 1960 to 1961 1
• 1962 to 1964 0
• 1965 to 1966 0
• 1967 to 1969 0
• 1970 to 1971 0
• 1972 to 1974 2