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
- 19 teams
1990-91
- 12 teams
1989-90
- 10 teams
1988-89
- 8 teams
1987-88
- 3 teams
1986-87
- 2 teams
1985-86
- 3 teams
1984-85
- 3 teams
1983-84
- 5 teams
1982-83
- 6 teams
1981-82
- 6 teams
1980-81
- 5 teams
1979-80
- 14 teams
1978-79
- 22 teams
1977-78
- 15 teams
1976-77
- 12 teams
1975-76
- 8 teams
1974-75
- 5 teams
1973-74
- 5 teams
1972-73
- 7 teams
1970-71
- 3 teams
1968-69
- 3 teams
1967-68
- 3 teams
1966-67
- 3 teams
1965-66
- 3 teams
1961-62
- 1 team
1960-61
- 1 team
1957-58
- 1 team
1955-56
- 1 team
1954-55
- 1 team
1953-54
- 1 team
1952-53
- 1 team
1951-52
- 1 team
1950-51
- 1 team
1949-50
- 1 team
1948-49
- 1 team
1947-48
- 1 team
1946-47
- 1 team
1945-46
- 1 team
1944-45
- 1 team
1943-44
- 1 team
1942-43
- 1 team
1941-42
- 1 team
1940-41
- 1 team
1939-40
- 1 team
1938-39
- 1 team
1937-38
- 1 team
1936-37
- 1 team
1935-36
- 1 team
1934-35
- 1 team
1933-34
- 1 team
1932-33
- 1 team
1931-32
- 1 team
1930-31
- 1 team
