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Term: 1840
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Term: 1841
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Term: 1842-1843
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Term: 1844-1845
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Term: 1846-1848
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Term: 1849
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Term: 1850–1852
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Term: 1853
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Term: 1854
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Term: 1854
EP
Term: 1855
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Term: 1856
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Term: 1854
DB
Term: 1858
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Term: 1849–1859
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Term: 1860
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Term: 1860–1861
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Term: 1862–1863
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Term: 1865
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Term: 1865–1866
DC
Term: 1867–1868
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Term: 1869–1870
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Term: 1870–1871
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Term: 1871–1872
JB
Term: 1872
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Term: 1983
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Term: 1873–1874
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Term: 1874–1875
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Term: 1876
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Term: 1876
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Term: 1877
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Term: October 1878
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Term: November 1878
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Term: 1879
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Term: 1881
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Term: 1882–1884
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Term: 1883–1885
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Term: 1885–1886, 1887–1888
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Term: 1887
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Term: 1889–1891
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Term: 1891
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Term: 1891–1893
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Term: 1893–1897
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Term: 1897–1899
JW
Term: 1899–1901
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Term: 1901–1905
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Term: 1907–1909
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Term: 1909–1913
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Term: 1915–1919
AC
Term: 1919–1923
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Term: 1923–1927
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Term: 1927–1947
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Term: 1947
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Term: 1947–1951
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Term: 1951–1963
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Term: 1963–1969
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Term: 1969–1971
SP
Term: 1971
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Term: 1971–1975
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Term: 1975–1983
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Term: 1983–1997
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Term: 1997–2001
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Term: 2001–2005
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Term: 2009–2013
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Term: 2013 – 2021