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April 10, 2006
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August 29, 2005
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March 29, 2004
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April 28, 2003
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September 1, 2000
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October 1, 1999
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October 1, 1998
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September 1, 1997
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September 1, 1996
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September 1, 1996
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September 1, 1995
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September 1, 1994
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April 1, 1994
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September 1, 1992
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September 1, 1991
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September 23, 1989