2021-22
- 24 teams
2021
- 1 team
2020-21
- 23 teams
2020
- 1 team
2019-20
- 19 teams
2018-19
- 18 teams
2018
- 2 teams
2017-18
- 17 teams
2016-17
- 13 teams
2016
- 2 teams
2015-16
- 13 teams
2014-15
- 11 teams
2014
- 2 teams
2013-14
- 14 teams
2012-13
- 13 teams
2012
- 2 teams
2011-12
- 11 teams
2010-11
- 8 teams
2010
- 2 teams
2009-10
- 8 teams
2008-09
- 11 teams
2007-08
- 9 teams
2006-07
- 14 teams
2006
- 2 teams
2005-06
- 10 teams
2004-05
- 10 teams
2003-04
- 10 teams
2002-03
- 9 teams
2001-02
- 7 teams
2001
- 1 team
2000-01
- 4 teams
2000
- 1 team
1999-00
- 6 teams
1998-99
- 3 teams
1997-98
- 6 teams
1996-97
- 3 teams
1995-96
- 5 teams
1994-96
- 1 team
1994-95
- 5 teams
1993-94
- 3 teams
1990-91
- 1 team
1989-90
- 1 team
