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before 2001
2001 : Dartmouth College
2002 : Tufts University
2003 : Massachusetts Institute of Technology
2004 : Wellesley College
2005 : Brown University
2006 : Wesleyan University
2007 : Harvard University
2008 : Connecticut College
2009 : Amherst College
2010 : Williams College
2011 : Yale University
2012 : Trinity College
2013 : Massachusetts Institute of Technology
2014 : Brown University
2015 : Tufts University
2016 : Wellesley College
2017 : Harvard University