Era
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1925-1968
2
1928-
1
1929
3
1929-1968
2
1929-2010
1
1930-
2
1933-1945
3
1936-1939
2
1936-1953
2
1938-
1
1939-1949
1
1944-1989
1
1944-1990
1
1945-1953
2
1945-1976
1
1945-1990
1
1945-1991
2
1947-
1
1948-1960
1
1948-1961
1
1949-
1
1949-1976
1
1953-1961
2
1961-1963
2
1961-1975
1
1961-1978
1
1965-
1
1985-1991
1
20th century
70
21st century
1
Boris III, 1918-1943
1
Civil War, 1936-1939
6
Civil War, 1944-1949
1
Civil War, 1945-1949
2
Republic, 1912-1949
1
Revolution, 1917-1921
1
Revolution, 1923-1924
1
Revolution, 1954-1962
1
Since 1900
1
Since 1947
1
Transfer of Sovereignty from Great Britain, 1997
1
approximately 1903-1971
1
approximately 1903-1998
1
d. 1989
1