At present, there are 44 Parties: Germany (E1), France (E2), Italy (E3), the Netherlands (E4), Sweden (E5), Belgium (E6), Hungary (E7), the Czech Republic (E8), Spain (E9), Yugoslavia (E10), the United Kingdom (E11), Austria (E12), Luxembourg (E13), Switzerland (E14), Norway (E16), Finland (E17), Denmark (E18), Romania (E19), Poland (E20), Portugal (E21), Russia (E22), Greece (E23), Ireland (E24), Croatia (E25), Slovenia (E26), Slovakia (E27), Belarus (E8), Estonia (E29), Bosnia and Herzegovina (E31), Latvia (E32), Bulgaria (E34), Türkiye (E37), Lithuania (E36), Azerbaijan (E39) Republic of Macedonia (E40), European Union (E42), Japan (E43), Australia (E45), Ukraine (E46), South Africa (E47), New Zealand (E48), Cyprus (E49), Malta (E50), South Korea (E51).

It can also be recognized by some non contracting countries, such as ASEAN, South America, and some countries covered by Africa.