June 1961 Spencerport, New York
September 1965 Braddock's Bay, New York
29 May 2009 Arvada, Colorado
17 June 2009 Amery, Wisconsin
23 March 2012 Sierpe, Costa Rica
2 August 2012 Tianjin, China
24 June 2014 Beijing, China
16 July 2014 Zhenjiang, China
8 December 2015 Lubumbashi, D.R. Congo
26 June 2017 Xi'an, China
24 June 2023 Istanbul, Turkey