• 1977 to 1977 2
• 1978 to 1978 16
• 1979 to 1979 11
• 1980 to 1980 19
• 1981 to 1981 47
• 1982 to 1982 34
• 1983 to 1983 34
• 1984 to 1984 36
• 1985 to 1985 39
• 1986 to 1986 44
• 1987 to 1987 38
• 1988 to 1988 42
• 1989 to 1989 15