Era
1980-
Since 1980
8
1989-
5
Since 1945
4
21st century
3
1918-
2
1945-
2
1945-1989
2
1968-
2
1974-
2
1982-
2
1948-1980
1
1960-
1
1960-1980
1
1963-
1
1971-
1
1971-1991
1
1979-
1
1979-1980
1
1980-1984
1
1984-
1
1988-
1
1988-2000
1
1994-
1
1999-
1
2000-
1
Since 1918
1
Since 1960
1
Since 1974
1
Since 1979
1