Era
20th century
34
1918-1933
14
1933-1945
13
19th century
9
1945-
7
1945-1990
6
1889-1945
5
18th century
5
1789-1900
4
1871-1918
4
1800-1933
2
1848-1870
2
1990-
2
17th century
1
1815-1898
1
1819-1898
1
1844-1900
1
1847-1934
1
1856-1939
1
1864-1920
1
1871-
1
1871-1933
1
1878-1929
1
1879-1955
1
1888-
1
1888-1918
1
1900-1945
1
1900-1954
1
1901-1910
1
1910-1935
1
1910-1936
1
1918-1945
1
1939-1945
1
1945-1955
1
1945-1991
1
1945-19990
1
1989-1990
1
21st century
1
2oth century
1
Allied occupation, 1918-1930
1
French occupation, 1923-1925
1
To 1933
1
Unification, 1990
1
William II, 1888-1918
1