1927 - 1930
1930 - 1934
1937 - 1942
1942 - 1945
1945 - 1949
1949 - 1950
1950 - 1959
1960 - 1961
1961 - 1977
1979 - 1997
1980 - 1991
1991 - 1992
1992 - 1996
1996 - 1997
1997 - 2013
2013 - 2016
since 2016
