Era
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Since 1960
5
Since 1976
5
Since 1979
5
Since 1985
5
1948-
4
1953-1985
4
1957-2011
4
1966-2006
4
1967-1973
4
1969-1974
4
1971-1981
4
1977-1981
4
1980-
4
1983-
4
1989-1993
4
2008
4
2017-
4
Revolution, 1979
4
Since 1980
4
Since 1990
4
1900-2099
3
1909-1997
3
1913-1994
3
1918-
3
1945-1964
3
1947-
3
1954-1964
3
1964-1985
3
1971-1990
3
1973-1988
3
1977-
3
1981-1989
3
1982-
3
1986-1991
3
1995-
3
1995-2005
3
1999-
3
2000 - 2099
3
Civil War, 1994-
3
Since 1933
3
Since 1970
3
Since 2002
3
Since 2003
3
1908-1957
2
1917-1979
2
1924-
2
1925-
2
1942-
2
1945-1991
2
1953-1961
2
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