Cyfnod
1945-
22
Since 1945
18
1990-
5
1991-
5
1970-
4
Since 1990
4
Since 1991
4
Since 1970
3
1960-
2
1968-
2
1971-
2
1971-1991
2
1972-
2
1974-
2
1974-2009
2
1975-
2
1975-2008
2
1979-1997
2
1980-
2
1981-
2
1981-2001
2
1982-1994
2
1983-
2
1986-
2
1989-
2
1997-
2
Since 1960
2
Since 1972
2
Since 1975
2
Since 1976
2
Since 1983
2
Since 1986
2
1918-
1
1945-1989
1
1946-
1
1947-
1
1948-1994
1
1949-
1
1952-
1
1958-
1
1961-
1
1961-1991
1
1965-
1
1966-1997
1
1966-1998
1
1968-1989
1
1968-1998
1
1970-1982
1
1971-1990
1
1973-
1
rhagor ...