Era
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Since 1997
4
To 1775
4
1644-1912
3
1700-1799
3
1800-1899
3
1818-1883
3
1868-
3
1908-
3
1918-1933
3
1946-
3
1969-1974
3
1969-1977
3
1970-
3
1971-
3
1971-1990
3
1985-
3
2008 - 2009
3
Charles I, 1625-1649
3
Since 1868
3
Since 1949
3
Since 1970
3
Since 1981
3
Since 1990
3
Since 2008
3
1328-1589
2
1500-1599
2
1590-1649
2
1757-1804
2
1761-1849
2
1783-1865
2
1790-1858
2
1806-1873
2
1872-1928
2
1892-1948
2
1907-1959
2
1912-1949
2
1914-1940
2
1939-1951
2
1945-1960
2
1945-1964
2
1945-1971
2
1953-
2
1961-
2
1961-1991
2
1964-1979
2
1970-1994
2
1974-1977
2
1975-
2
1975-2008
2
1976-2002
2
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