2019 Las Vegas
2018 New Orleans
2017 San Diego
2016 Orlando
2015 Las Vegas
2014 New Orleans
2013 Chicago
2012 San Francisco
2011 San Diego
2010 New Orleans
2009 Vienna
2009 Las Vegas
2008 San Francisco
2007 San Diego
2006 Chicago
2005 Lisbon
2005 Washington
2004 Sydney
2004 San Francisco
2020 Adelaide
2019 Leiden
2018 Reykjavik
2017 San Francisco
2016 Manchester
2015 Gothenburg
2014 Boston
2013 Stratford upon Avon
2012 Bergen