2024-25
- 6 teams
2023-24
- 11 teams
2022-23
- 7 teams
2021-22
- 5 teams
2020-21
- 4 teams
2019-20
- 6 teams
2018-19
- 5 teams
2017-18
- 5 teams
2016-17
- 3 teams
2015-16
- 2 teams
2014-15
- 1 team
2011-12
- 5 teams
2010-11
- 5 teams
2009-10
- 5 teams
2007-08
- 1 team
2006-07
- 2 teams
2005-06
- 6 teams
2004-05
- 5 teams
2003-04
- 5 teams
2002-03
- 2 teams
2001-02
- 5 teams
2000-01
- 4 teams
1999-00
- 3 teams
1998-99
- 3 teams
1997-98
- 4 teams
1996-97
- 7 teams
1995-96
- 8 teams
1994-95
- 6 teams
1993-94
- 9 teams
1992-93
- 11 teams
1991-92
- 11 teams
1990-91
- 7 teams
1989-90
- 3 teams
1988-89
- 8 teams
1987-88
- 9 teams
1986-87
- 6 teams
1985-86
- 6 teams
1984-85
- 6 teams
1983-84
- 8 teams
1982-83
- 5 teams
1981-82
- 4 teams
1980-81
- 20 teams
1979-80
- 22 teams
1978-79
- 27 teams
1977-78
- 22 teams
1976-77
- 17 teams
1975-76
- 13 teams
1974-75
- 6 teams
1973-74
- 3 teams
1969-70
- 1 team
1968-69
- 1 team
