Era
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Since 1968
7
Since 1974
7
Unification, 1990
7
1700-1799
6
1861-1917
6
1882-1945
6
1912-1945
6
1914-1940
6
1914-1945
6
1918-1932
6
1943-1955
6
1945-1964
6
1945-1966
6
1945-1991
6
1946-1986
6
1954-1964
6
1961-1971
6
1976-1994
6
1982-1994
6
1983-2002
6
1993-2001
6
1994-2011
6
1999-
6
2011-
6
2017-2021
6
Since 1865
6
Since 1975
6
Since 1983
6
Since 1985
6
Since 1986
6
Since 1993
6
To 1789
6
1777-1852
5
1861-1865
5
1886-1903
5
1900 - 1999
5
1910-1943
5
1919-1947
5
1921-2008
5
1928-1932
5
1942-2011
5
1952-1998
5
1955-1965
5
1961-1978
5
1963-
5
1963-1969
5
1969-
5
1973-1988
5
2017-
5
711-1516
5
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