2013 University of Colorado, Boulder
2013 Tsinghua University
2012 Zhejiang University
2012 University of Louisville
2011 Tsinghua University
2011 Harvey Mudd College
2010 Huazhong University of Science and Technology
2010 Rensselaer Polytechnic Institute
2009 Harvard University
2009 Southwestern University
2008 State University of New York, Buffalo
2008 Harvard University
2007 Massachusetts Institute of Technology
2007 University of Stellenbosch
2006 University of Colorado, Boulder
2006 Harvard University
2005 Harvey Mudd College
2005 Rensselaer Polytechnic Institute
2004 Harvey Mudd College
2004 University of Colorado, Boulder
2003 California Institute of Technology
2003 University of Colorado, Boulder
2002 University of Washington
2002 Duke University
2001 U.S. Military Academy
2001 Wake Forest University
2000 U.S. Military Academy
2000 Wake Forest University
1999 Harvey Mudd College (two teams)
1999 Earlham College
1998 Macalester College
1998 Harvey Mudd College
1997 Washington University, St. Louis
1997 University of Toronto
1996 Pomona College
1996 St. Bonaventure University
1995 Iowa State University
1995 University of Alaska, Fairbanks
1994 North Carolina School of Science and Mathematics
1994 University of North Carolina, Chapel Hill
1993 University of Alaska, Fairbanks
1993 University of California, Berkeley
1992 Oklahoma State University
1992 Pomona College
1991 University of Alaska, Fairbanks
1991 University of Western, Ontario
1990 California Polytechnic State University
1990 Rose-Hulman Institute of Technology
1989 California Institute of Technology
1989 Harvey Mudd College
1988 Harvard University