Previous USD Meetings
- 2022: USD12 in Benasque, Spain
- 2019 : USD11 in Qiandao Lake, Zhejiang, China.y
- 2017 : USD10 in Inzell, Germany
- 2015: USD9 in Lake Biwa, Japan
- 2013 : USD8 in Estes Park, U.S.A.
- 2010 : USD7 in Brijuni Islands, Croatia
- 2008 : USD6 in Kloster Banz, Germany
- 2006 : USD5 in Abashiri, Japan
- 2003 : USD4 in Telluride, U.S.A.
- 2001 : USD3 in San Sebastian, Spain
- 1999 : USD2 in Ringberg, Germany
- 1997 : USD1 in Ascona, Switzerland
