1996
- 5 teams
1995
- 7 teams
1994
- 8 teams
1993
- 9 teams
1992
- 11 teams
1991
- 10 teams
1990
- 8 teams
1989
- 9 teams
1988
- 13 teams
1987
- 12 teams
1986
- 14 teams
1985
- 14 teams
1984
- 13 teams
1983
- 14 teams
1982
- 12 teams
1981
- 9 teams
1980
- 7 teams
1979
- 6 teams
1978
- 7 teams
1977
- 8 teams
1976
- 5 teams
1975
- 4 teams
1974
- 3 teams
1973
- 3 teams
