| Country | Action | Action Date | Effective Date |
|---|
| BELGIUM | Signature | 15/12/1975 | |
| BELGIUM | Ratification | 06/04/1979 | |
| Berlin West | Extension | 16/10/1978 | |
| DENMARK | Signature | 15/12/1975 | |
| FRANCE | Signature | 15/12/1975 | |
| FRANCE | Ratification | 07/08/1980 | |
| GERMANY FEDERAL REPUBLIC | Signature | 15/12/1975 | |
| GERMANY FEDERAL REPUBLIC | Ratification | 16/10/1978 | |
| GREECE | Accession | 20/05/1987 | 01/09/1987 |
| GREECE | Declaration | 20/05/1987 | |
| IRELAND, REPUBLIC OF | Signature | 15/12/1975 | |
| IRELAND, REPUBLIC OF | Ratification | 13/01/1981 | |
| ITALY | Signature | 15/12/1975 | |
| ITALY | Ratification | 10/03/1980 | |
| LUXEMBOURG | Signature | 15/12/1975 | |
| LUXEMBOURG | Ratification | 12/08/1977 | |
| NETHERLANDS THE | Signature | 15/12/1975 | |
| NETHERLANDS THE | Ratification | 28/02/1980 | |
| PORTUGAL | Accession | 31/03/1987 | 01/09/1987 |
| UNITED KINGDOM | Signature | 15/12/1975 | |
| UNITED KINGDOM | Ratification | 12/02/1980 | |