There were 18 founding members: Australia, Cambodia, Costa Rica, Denmark, Ethiopia, Guyana, Indonesia, Kiribati, Mexico, Norway, Papua New Guinea, Paraguay, the Philippines, Qatar, the Republic of Korea, the United Arab Emirates, the United Kingdom and Vietnam.
Since its inauguration as an international organization, Fiji, Hungary, Jordan, Mongolia, Peru, Rwanda, Senegal, Thailand, and Vanuatu have become Member countries.