• 1981 to 1981 1
• 1982 to 1983 1
• 1984 to 1985 2
• 1986 to 1987 2
• 1988 to 1989 0
• 1990 to 1991 0
• 1992 to 1993 1
• 1994 to 1995 2
• 1996 to 1997 2
• 1998 to 1999 1