Text Box: 1951 – ECSC
1956 – Treaty of Rome (EC):
Benelux, France, Germany & Italy
Text Box: 1973 – Denmark, Ireland & UKText Box: 1982 - GreeceText Box: 1986 – Portugal & SpainText Box: 1995 – Austria, Finland & SwedenText Box: 2004 – Cyprus, Czech Republic, Estonia, Hungary, Latvia, Lithuania, Malta, Poland, Slovakia & Slovenia