Era
20th century
22
1945-
12
1900-1999
6
1953-1961
5
1945-1953
4
Since 1900
4
1945-1989
3
1951-
3
1989-
3
Since 1945
2
1905-1991
1
1910-1996
1
1914-2005
1
1915-1999
1
1917-1964
1
1920-1964
1
1922-1987
1
1929-1968
1
1933-1945
1
1935-1977
1
1939-1975
1
1945-1961
1
Blockade, 1948-1949
1
Elizabeth II, 1952-
1
To 1964
1