• 1980 to 1981 15
• 1982 to 1983 11
• 1984 to 1985 8
• 1986 to 1987 2
• 1988 to 1989 0
• 1990 to 1991 3
• 1992 to 1993 2
• 1994 to 1995 3
• 1996 to 1997 3
• 1998 to 1999 6