Era
1991-
29
20th century
11
1985-1991
8
1989-
4
1952-
3
19th century
3
1925-1953
2
21st century
2
Unification, 1990
2
1533-1917
1
1672-1725
1
1801 - 1917
1
1801-1917
1
1844-1930
1
1866-1944
1
1878-1952
1
1878-1953
1
1879-1953
1
1881-1962
1
1917-1945
1
1917-1970
1
1923-2005
1
1931-2007
1
1936-1953
1
1945-1991
1
1953-1975
1
1953-1985
1
1970-1991
1
1989
1
1990-
1
Civil War, 1994-
1
Revolution, 1917-1921
1