Era
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1963-1969
7
1968-
7
1970-1973
7
1981-1995
7
1982-1994
7
1986-
7
2003-
7
2008 - 2009
7
Civil War, 1861-1865
7
Since 1988
7
To 1999
7
1871-1918
6
1933-
6
1933-1937
6
1960-1980
6
1965-1975
6
1968-1989
6
1970-1982
6
1974-1990
6
1974-2009
6
1989-1993
6
2007-
6
Qing dynasty, 1644-1912
6
1660-1688
5
1837-1901
5
1861-1917
5
1868-
5
1919-1947
5
1945-1955
5
1945-1983
5
1971-1975
5
1974-1977
5
1997-2007
5
2017-
5
Since 1865
5
Since 1948
5
Since 1971
5
Since 1999
5
1815-1861
4
1857-1919
4
1865-1918
4
1894-1971
4
1908-1973
4
1910-1946
4
1912-2006
4
1914-
4
1914-1940
4
1917-1963
4
1919-1933
4
1936-1945
4
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