2022
- 7 teams
2021-22
- 18 teams
2021
- 31 teams
2020-21
- 6 teams
2020
- 25 teams
2019-20
- 6 teams
2019
- 22 teams
2018-19
- 9 teams
2018
- 12 teams
2017-18
- 7 teams
2017
- 9 teams
2016-17
- 3 teams
2016
- 7 teams
2015-16
- 3 teams
2015
- 4 teams
2014-15
- 4 teams
2014
- 4 teams
2013-14
- 4 teams
2013
- 4 teams
2012
- 7 teams
2011
- 5 teams
2010-11
- 2 teams
2010
- 4 teams
2009-10
- 4 teams
2008-09
- 5 teams
2007-08
- 6 teams
2006-07
- 4 teams
2006
- 2 teams
2005-06
- 4 teams
2005
- 3 teams
2004-05
- 4 teams
2004
- 1 team
2003-04
- 6 teams
2003
- 2 teams
2002-03
- 7 teams
2001-02
- 12 teams
2000-01
- 11 teams
1999-00
- 10 teams
1999
- 1 team
1998-99
- 3 teams
1997-98
- 6 teams
1996-97
- 5 teams
1995-96
- 4 teams
1994-95
- 5 teams
1993-94
- 5 teams
1992-93
- 3 teams
1992
- 3 teams
1991
- 1 team
1990
- 1 team
1989-90
- 1 team
1988-89
- 1 team
1988
- 1 team
1986-87
- 3 teams
1985-86
- 3 teams
1985
- 1 team
1982-83
- 1 team
1980
- 1 team
1979-80
- 4 teams
1977-78
- 7 teams
1977
- 6 teams
1976-77
- 6 teams
1976
- 4 teams
1975-76
- 12 teams
1975
- 5 teams
1974-75
- 13 teams
1974
- 3 teams
1973-74
- 11 teams
1973
- 4 teams
1972-73
- 10 teams
1972
- 10 teams
1971-72
- 15 teams
1971
- 6 teams
1970-71
- 17 teams
1970
- 6 teams
1969-70
- 17 teams
1969
- 2 teams
1968-71
- 1 team
1968-69
- 17 teams
1968
- 5 teams
1967-68
- 17 teams
1967
- 2 teams
1966-67
- 15 teams
1965-66
- 15 teams
1964-65
- 15 teams
1963-64
- 17 teams
1962-63
- 17 teams
1961-62
- 14 teams
1960-61
- 16 teams
1959-60
- 14 teams
1959
- 4 teams
1958-59
- 15 teams
1957-58
- 15 teams
1956-61
- 1 team
1956-57
- 15 teams
1955-56
- 3 teams
