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From June 9, 1973 to December 20, 1973
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From December 31, 1973 to July 1, 1976
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From March 31, 1979 to February 26, 1981
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From February 26, 1981 to December 2, 1982
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From December 2, 1982 to march 4, 1996
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From May 4, 1996 to March 15, 2004
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From December 20, 2011 to June 2, 2018
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From June 2, 2018 until now