2025-26
- 8 teams
2024-25
- 18 teams
2023-24
- 19 teams
2022-23
- 21 teams
2021-22
- 15 teams
2020-21
- 9 teams
2019-20
- 16 teams
2018-19
- 9 teams
2017-18
- 7 teams
2016-17
- 7 teams
2015-16
- 7 teams
2014-15
- 3 teams
2012-13
- 6 teams
2011-12
- 4 teams
2009-10
- 3 teams
2008-09
- 4 teams
2007-08
- 5 teams
2006-07
- 3 teams
2005-06
- 4 teams
2004-05
- 4 teams
2002-03
- 2 teams
2001-02
- 3 teams
2000-01
- 6 teams
1995-96
- 3 teams
1992-93
- 5 teams
1991-92
- 6 teams
1988-89
- 5 teams
1987-88
- 3 teams
1986-87
- 4 teams
1985-86
- 3 teams
1984-85
- 6 teams
1983-84
- 3 teams
1982-83
- 3 teams
1981-82
- 4 teams
1980-81
- 6 teams
1979-80
- 4 teams
1977-78
- 3 teams
1976-77
- 4 teams
1975-76
- 4 teams
1974-75
- 4 teams
1973-74
- 5 teams
1972-73
- 4 teams
1971-72
- 3 teams
1970-71
- 5 teams
1965-66
- 3 teams
1964-65
- 3 teams
1963-64
- 2 teams
1961-62
- 2 teams
1960-61
- 2 teams
1957-58
- 1 team
1956-57
- 1 team
1952-53
- 1 team
1949-50
- 2 teams
1948-49
- 4 teams
1941-42
- 1 team
1931-32
- 1 team
