Era
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1951-
1
1952-1970
1
1955-
1
1960-
1
1961-1994
1
1962
1
1963 April 11
1
1966-
1
1970-1981
1
1971-
1
1975
1
1975-
1
1976
1
1976 - 2000
1
1980
1
1981-
1
1988-
1
1989
1
1991
1
1993
1
1994
1
1994-
1
1995-
1
2000 -
1
2001
1
2001-2009
1
2002-
1
2009-
1
2009-2017
1
21 century --
1
21th century
1
21th century --
1
2oth century
1
Civil war, 2011-
1
Japanese occupatin, 1742-1945
1