Era
1916-1988
1
1938-
2
1939-1975
1
1943-
1
1945-
5
1945-1982
4
1946-
1
1952-
1
1955-
1
1956-
1
1970-
1
1973-
3
1973-1985
2
1973-1988
1
1975-
4
1975-1982
10
1975-2008
1
1980-
5
1982-
1982-2006
2
1983-
1
1985-
1
1988-
1
2006-
1
20th century
5
21st century
4
Siglo 20
1
Since 1945
3
Since 1975
1
Since 1980
1
Since 1982
6