2026 - Northern Illinois University
2025 - Central Piedmont Community College
2024 - University of California, Davis
2023 - University of Idaho
2022 - University of Tennessee, Knoxville
2021 - University of Alabama and University of Illinois, Urbana-Champaign
2019 - University of Kentucky
2018 - Cornell University
2017 - University of Puerto Rico and University of California, San Diego
2016 - University of Georgia
2014 - University of California, Berkeley
2013 - University of California, Berkeley
2012 - Northern Arizona University
2011 - University of California, Santa Barbara
2010 - Brown University
2009 - Texas A&M University
2008 – University of California, Berkeley
2007 - Brown University
2006 - San Diego State University
2005 - University of Arizona
2004 - Indiana University/University of Nevada-Reno