• 1970 to 1970 7
• 1971 to 1971 6
• 1972 to 1972 10
• 1973 to 1973 6
• 1974 to 1974 7
• 1975 to 1975 6
• 1976 to 1976 9
• 1977 to 1977 6
• 1978 to 1978 2
• 1979 to 1979 0