Member| Joined
| | Austria | 1995
| | Belgium | 1958
| | Bulgaria | 2007
| | Croatia | 2014
| | Cyprus | 2004
| | Czech Republic | 2004
| | Denmark | 1973
| | Estonia | 2004
| | Finland | 1995
| | France | 1958
| | Germany | 1958
| | (East Germany) | 1990
| | Greece | 1981
| | Hungary | 2004
| | Ireland | 1973
| |
|---|
|
Member| Joined
| | Italy | 1958
| | Latvia | 2004
| | Lithuania | 2004
| | Luxembourg | 1958
| | Malta | 2004
| | Netherlands | 1958
| | Poland | 2004
| | Portugal | 1986
| | Romania | 2007
| | Slovakia | 2004
| | Slovenia | 2004
| | Spain | 1986
| | Sweden | 1995
| | United Kingdom | 1973
| |
|---|
|