1926 - 1945
1945 - 1954
1954 - 1970
1970 - 1982
1982 - 1988
1988 - 1990
1990 - 1991
1991 - 1993
1993 - 1995
1995 - 2000
2000 - 2009
2009 - 2010
2010 - 2011
2011 - 2012
2012 - 2013
since 2013
