1998
- 1 team
1997
- 11 teams
1996
- 8 teams
1995
- 9 teams
1994
- 9 teams
1993
- 9 teams
1992
- 20 teams
1991
- 20 teams
1990
- 9 teams
1989
- 8 teams
1988
- 3 teams
1987
- 4 teams
1986
- 3 teams
1984
- 3 teams
1983
- 3 teams
1982
- 3 teams
1981
- 4 teams
1980
- 5 teams
1979
- 5 teams
1978
- 4 teams
1977
- 3 teams
1976
- 2 teams
1973
- 3 teams
1972
- 4 teams
1971
- 5 teams
1970
- 6 teams
1969
- 4 teams
1968
- 5 teams
1967
- 4 teams
1966
- 3 teams
1965
- 3 teams
1964
- 3 teams
1963
- 5 teams
1962
- 5 teams
1961
- 4 teams
1960
- 3 teams
1959
- 3 teams
1958
- 2 teams
1957
- 3 teams
1956
- 3 teams
1955
- 3 teams
1954
- 3 teams
1953
- 3 teams
1952
- 3 teams
