• 1970 to 1970 0
• 1971 to 1971 0
• 1972 to 1972 1
• 1973 to 1973 2
• 1974 to 1974 4
• 1975 to 1975 6
• 1976 to 1976 7
• 1977 to 1977 7
• 1978 to 1978 11
• 1979 to 1979 8