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September 25, 2018
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January 10, 2017
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November 1, 2016
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March 22, 2016
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January 12, 2016
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November 1, 2013
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May 16, 2013
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March 30, 2010
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February 1, 2010
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July 1, 2009
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March 1, 2009
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January 12, 2009
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January 1, 2009
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November 1, 2008
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July 1, 2008
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July 1, 2007
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November 1, 2006
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November 1, 2006
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October 1, 2006
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May 30, 2005
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May 1, 2005
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May 1, 2004
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March 1, 2004
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September 1, 2003
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March 15, 2003
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July 1, 2002
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November 13, 2001
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August 1, 2001
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May 31, 2001
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May 1, 2001
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March 1, 2001
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March 1, 2001
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December 31, 2000
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December 1, 2000
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May 31, 2000
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April 30, 2000
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September 30, 1999
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September 1, 1999
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September 1, 1998
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April 1, 1998
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September 30, 1997
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March 1, 1997
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September 1, 1995
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September 1, 1994
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May 1, 1994
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March 31, 1993