| Country | Action | Action Date | Effective Date |
|---|
| AUSTRIA | Accession | 30/12/1986 | |
| BELGIUM | Signature | 30/05/1975 | |
| BELGIUM | Ratification | 03/10/1978 | |
| DENMARK | Signature | 30/05/1975 | |
| DENMARK | Ratification | 15/09/1977 | |
| FINLAND | Ratification | 01/11/1995 | |
| FRANCE | Signature | 30/05/1975 | |
| FRANCE | Ratification | 30/10/1980 | |
| FRANCE | Declaration | 30/12/1980 | |
| GERMANY FEDERAL REPUBLIC | Signature | 30/05/1975 | |
| GERMANY FEDERAL REPUBLIC | Ratification | 26/07/1977 | |
| GREECE | Ratification | 09/03/2005 | |
| IRELAND, REPUBLIC OF | Signature | 31/12/1975 | |
| IRELAND, REPUBLIC OF | Ratification | 10/12/1980 | |
| ITALY | Signature | 30/05/1975 | |
| ITALY | Ratification | 20/02/1978 | |
| LUXEMBOURG | Ratification | 30/06/2005 | |
| NETHERLANDS THE | Signature | 30/05/1975 | |
| NETHERLANDS THE | Ratification | 06/02/1979 | |
| NORWAY | Accession | 30/12/1986 | |
| PORTUGAL | Accession | 14/11/2000 | |
| SPAIN | Signature | 30/05/1975 | |
| SPAIN | Ratification | 07/02/1979 | |
| SWEDEN | Signature | 30/05/1975 | |
| SWEDEN | Ratification | 06/04/1976 | |
| SWITZERLAND | Signature | 30/05/1975 | |
| SWITZERLAND | Ratification | 19/11/1976 | |
| UNITED KINGDOM | Signature | 30/05/1975 | |
| UNITED KINGDOM | Ratification | 28/03/1978 | |