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July 14, 2000
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May 22, 1998
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June 17, 1996
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July 12, 1994
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June 2, 1992
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May 18, 1992
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May 2, 1990
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July 1, 1988
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September 12, 1986
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March 7, 1984
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August 30, 1982
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May 18, 1982
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July 1, 1975
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April 23, 1973
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April 3, 1972
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June 14, 1971
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April 20, 1970
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August 26, 1969
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September 26, 1968
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August 31, 1966
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October 16, 1961