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National average for the 1991-1992 academic year at four-year universities.
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National average for the 1992-1993 academic year at four-year universities.
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National average for the 1993-1994 academic year at four-year universities.
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National average for the 1994-1995 academic year at four-year universities.
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National average for the 1995-1996 academic year at four-year universities.
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National average for the 1996-1997 academic year at four-year universities.
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National average for the 1997-1998 academic year at four-year universities.
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National average for the 1998-1999 academic year at four-year universities.
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National average for the 1999-2000 academic year at four-year universities.
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National average for the 2000-2001 academic year at four-year universities.
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National average for the 2001-2002 academic year at four-year universities.
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National average for the 2002-2003 academic year at four-year universities.
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National average for the 2003-2004 academic year at four-year universities.
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National average for the 2004-2005 academic year at four-year universities.
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National average for the 2005-2006 academic year at four-year universities.
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National average for the 2006-2007 academic year at four-year universities.
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National average for the 2007-2008 academic year at four-year universities.
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National average for the 2008-2009 academic year at four-year universities.
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National average for the 2009-2010 academic year at four-year universities.
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National average for the 2010-2011 academic year at four-year universities.
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National average for the 2011-2012 academic year at four-year universities.