Era
1878-1953
1
1894-1971
1
1900 - 1999
1
1900-1999
5
1945 - 1995
2
1945 1989
1
1945-
4
1945-1989
1945-1991
7
1953-1985
1
1955-1965
1
1970-1991
1
1975-1985
2
1980-1989
4
1981-1989
1
1985 1991
1
1985-1991
5
1985-1995
2
1986-1991
1
1989-
8
20th century
12
Intervention, 1968
2
Revolution, 1956
3
Since 1900
1
Since 1945
4