2020
- 2 teams
2019
- 6 teams
2018
- 12 teams
2017
- 11 teams
2016-17
- 1 team
2016
- 6 teams
2015-16
- 1 team
2014-15
- 3 teams
2013-14
- 3 teams
2013
- 1 team
2012-13
- 2 teams
2012
- 3 teams
2011-12
- 4 teams
2011
- 4 teams
2010-11
- 3 teams
2010
- 3 teams
2009-10
- 4 teams
2009
- 2 teams
2008-09
- 5 teams
2008
- 2 teams
2007-08
- 6 teams
2007
- 2 teams
2006-07
- 5 teams
2006
- 2 teams
2005-06
- 6 teams
2005
- 8 teams
2004-05
- 5 teams
2004
- 7 teams
2003-05
- 1 team
2003-04
- 3 teams
2003
- 9 teams
2002-03
- 3 teams
2002
- 10 teams
2001-02
- 2 teams
2001
- 13 teams
2000
- 12 teams
1999
- 13 teams
1998-99
- 3 teams
1998
- 15 teams
1997-98
- 3 teams
1997
- 15 teams
1996-97
- 4 teams
1996
- 9 teams
1995-96
- 4 teams
1995
- 6 teams
1994-95
- 2 teams
1994
- 3 teams
1993-94
- 5 teams
1992-93
- 4 teams
1992
- 3 teams
1991-92
- 3 teams
1991
- 3 teams
1990-91
- 3 teams
1990
- 6 teams
1989-90
- 4 teams
1989
- 7 teams
1988-89
- 4 teams
1988
- 4 teams
1987-88
- 6 teams
1987
- 7 teams
1986-87
- 5 teams
1986
- 6 teams
1985-86
- 5 teams
1985
- 5 teams
1984-85
- 7 teams
1984
- 8 teams
1983-84
- 5 teams
1983
- 8 teams
1982-86
- 1 team
1982-83
- 4 teams
1982
- 6 teams
1981-82
- 3 teams
1981
- 2 teams
1980
- 6 teams
