Canada

 Victoria City, Canada

1980-10-20

 Italy

Venice

1980-3-24

 Japan

Ikeda

1981-6-6

 Japan

Kanazawa

1981-6-13

USA

Portland, Oregon

1988-6-7

Romania

Tulcea

1995-9-20

 ROK

Jeonju

1996-3-21

 Latvia 

Riga

1997-9-22

 France

Grenoble

1998-9-20

 Egypt

Ismailia

1998-3-3

the Netherlands

Nijmegen

1999-9-23

 Denmark

Esbjerg

2002-8-20

Brazil

Porto de Alegre

2004-6-22

Madagascar

Antananarivo

2005-11-29

Germany

Konstanz

2007-10-18

New Zealand

Taupo

2008-02-07

Australia

Logan

2009-11-09

Sweden

Kronoberg County

2012-08-22

Poland

Nowy Sacz

2016-06-14

the Republic of Congo

Pointe-Noire

2016-07-05

Maldives

Male

2016-07-15