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October 1, 2012
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December 1, 2011
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February 1, 2011
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October 1, 2009
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May 1, 2009
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December 1, 2008
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June 1, 2008
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February 1, 2007
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February 1, 2006
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May 1, 2004
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June 1, 2003
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June 1, 2001
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May 1, 2001
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December 1, 1999
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December 1, 1999
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February 1, 1999
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February 17, 1998
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May 17, 1997
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November 18, 1996
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January 11, 1996
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August 23, 1995
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December 13, 1994
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April 1, 1994
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June 16, 1993
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February 25, 1993
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August 18, 1992
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April 16, 1992
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December 23, 1991
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August 1, 1991
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April 23, 1991