Era
1960-
Since 1960
3
1916-1995
2
1920-1998
2
1929-1968
2
1934-
2
1945-
2
1948-1994
2
1960-1997
2
1974-1977
2
1975-
2
1975-1994
2
1977-1981
2
1989-
2
1772-1811
1
1889-1945
1
1913-2015
1
1918-1981
1
1922-1995
1
1925-2019
1
1929-2004
1
1934-2016
1
1935-2023
1
1939-2018
1
1946-
1
1952-
1
1954-
1
1960 - 1991
1
1960-1991
1
1972-
1
1973-
1
1977-
1
1979-
1
1991-
1
20th century
1
Elections, 2015
1
Since 1974
1
Since 1991
1