2009-10
- 9 teams
2008-09
- 6 teams
2007-08
- 5 teams
2006-07
- 2 teams
1993-94
- 6 teams
1992-93
- 11 teams
1991-92
- 18 teams
1990-91
- 11 teams
1989-90
- 10 teams
1988-89
- 7 teams
1987-88
- 2 teams
1986-87
- 2 teams
1985-86
- 3 teams
1984-85
- 3 teams
1983-84
- 5 teams
1982-83
- 6 teams
1981-82
- 5 teams
1980-81
- 5 teams
1979-80
- 12 teams
1978-80
- 1 team
1978-79
- 18 teams
1977-78
- 12 teams
1976-77
- 12 teams
1975-76
- 8 teams
1975
- 1 team
1974-75
- 5 teams
1973-74
- 5 teams
1972-73
- 7 teams
1971
- 1 team
1970-71
- 3 teams
1970
- 1 team
1968-69
- 3 teams
1968
- 1 team
1967-68
- 3 teams
1965-67
- 1 team
1964
- 1 team
1963-65
- 1 team
1963-64
- 1 team
1961-63
- 1 team
1960-61
- 1 team
1960
- 1 team
1958
- 1 team
1957-60
- 1 team
1933-57
- 1 team
1932-33
- 1 team
1931-32
- 1 team
1930-31
- 1 team
