Era
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1952-
2
1958-
2
1966-1997
2
1971-1991
2
1971-2001
2
1972-
2
1973-1988
2
1974-
2
1974-2009
2
1976-
2
1979-1997
2
1981-1995
2
1982-2006
2
1983-
2
1988-
2
1988-2002
2
1993-
2
2009-
2
20th century
2
Since 1947
2
Since 1949
2
Since 1952
2
Since 1958
2
Since 1966
2
Since 1972
2
Since 1975
2
Since 1979
2
Since 1983
2
Since 1988
2
1918-1945
1
1945-1964
1
1945-1981
1
1945-1982
1
1945-1984
1
1945-1989
1
1945-1995
1
1946-
1
1959-
1
1960-1988
1
1960-2002
1
1965-
1
1966-1998
1
1968-1989
1
1968-1998
1
1969-
1
1970-1982
1
1973-1985
1
1974-1999
1
1975-1982
1
1975-1990
1
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