Era
20th century
6
1900-1999
4
1985-1991
3
1988-
3
1991-
3
1809-1865
2
1877-1949
2
1931-1939
2
Republic, 1931-1939
2
Since 1985
2
1735-1826
1
1767-1848
1
1783-1865
1
1800-1899
1
1805-1872
1
1805-1879
1
1815-1861
1
1815-1870
1
1884-1968
1
1946-1970
1
1948-
1
1953-2007
1
1970-1988
1
1975-1982
1
1980-
1
1993-2001
1
19th century
1
2001-2009
1
Athenian supremacy, 479-431 B.C.
1
Since 1948
1
To 1500
1
approximately 495 B.C.-429 B.C.
1