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July 1, 2012
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March 1, 2010
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March 1, 2008
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September 1, 2006
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March 1, 2006
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September 1, 2005
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February 1, 2004
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May 1, 2003
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September 1, 2001
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April 1, 2001
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April 1, 2001
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April 1, 2001
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September 10, 1996
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September 28, 1994
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October 14, 1993
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April 29, 1992
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October 18, 1991