Era
20th century
5
21st century
5
1900-1999
4
1991-
4
Civil War, 2011-
4
1913-1994
3
1913-2006
3
1974-
3
2007-
3
1923-
2
1924-
2
1960-
2
1969-1974
2
1970-
2
1974-1977
2
2001-2021
2
1894-1984
1
1913-2001
1
1914-1996
1
1917-2002
1
1927-2019
1
1928-2017
1
1928-2021
1
1946-
1
1946-1974
1
1975-1994
1
1977-1981
1
1978-
1
1979-
1
1979-1980
1
1980-
1
1981-
1
1991-2003
1
2000-
1
2001-
1
2003-
1
2014-
1
Civil War, 1983-2009
1
Since 1900
1
Since 1974
1
Since 1991
1