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March 1, 2019
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October 1, 2016
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March 1, 2016
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August 1, 2013
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January 1, 2013
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July 1, 2012
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November 1, 2011
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February 1, 2011
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June 1, 2010
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June 1, 2009
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January 1, 2009
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May 1, 2008
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November 1, 2007
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June 1, 2007
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June 1, 2006
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November 30, 2005
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March 1, 2004
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September 1, 2003
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April 1, 2003
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July 1, 2002
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January 1, 2001
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November 1, 2000
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August 1, 2000
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October 13, 1998
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February 15, 1995
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March 24, 1993
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August 19, 1991