• 1980 to 1980 2
• 1981 to 1981 6
• 1982 to 1982 2
• 1983 to 1983 6
• 1984 to 1984 1
• 1985 to 1985 4
• 1986 to 1986 3
• 1987 to 1987 2
• 1988 to 1988 0
• 1989 to 1989 1