July 21, 1977
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June 17, 1982
July 7, 1982
September 15, 1982
October 28, 1982
September 21, 1982
March 2, 1983
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June 27, 1983
October 18, 1984
October 30, 1984
December 14, 1984
April 20, 1985
October 26, 1985
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April 20, 1989
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July 7, 1989
December 10, 1989
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February 18, 1994
October 24, 1994
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November 5, 1995
October 16, 1996
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September 27, 2006
June 2, 2007