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January 2, 2018
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January 31, 2017
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August 16, 2016
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September 29, 2015
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September 30, 2014
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May 1, 2012
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September 1, 2009
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February 1, 2009
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September 1, 2008
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August 1, 2007
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April 1, 2007
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January 1, 2006
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April 1, 2004
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March 1, 2004
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September 1, 2001
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April 1, 2001
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March 1, 2001
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January 1, 2001
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March 1, 1999
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October 1, 1997
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September 1, 1996
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April 1, 1996
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September 1, 1994
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October 1, 1993
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March 30, 1992
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April 24, 1991
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August 22, 1988
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April 18, 1983
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March 9, 1981
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March 1, 1980
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May 16, 1977
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April 26, 1976
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November 1, 1973