| Country | Action | Action Date | Effective Date |
|---|
| AUSTRALIA | Signature | 09/04/1975 | |
| AUSTRIA | Signature | 09/04/1975 | |
| AUSTRIA | Ratification | 22/06/1976 | |
| BELGIUM | Signature | 09/04/1975 | |
| BELGIUM | Ratification | 16/04/1976 | |
| CANADA | Signature | 09/04/1975 | |
| CANADA | Acceptance | 23/02/1976 | |
| DENMARK | Signature | 09/04/1975 | |
| DENMARK | Ratification | 23/07/1975 | |
| FINLAND | Signature | 09/04/1975 | |
| FRANCE | Signature | 09/04/1975 | |
| GERMANY FEDERAL REPUBLIC | Signature | 09/04/1975 | |
| GERMANY FEDERAL REPUBLIC | Ratification | 08/06/1976 | |
| GREECE | Signature | 09/04/1975 | |
| GREECE | Ratification | 17/06/1976 | |
| ICELAND | Signature | 09/04/1975 | |
| ICELAND | Ratification | 15/06/1976 | |
| IRELAND, REPUBLIC OF | Signature | 09/04/1975 | |
| IRELAND, REPUBLIC OF | Ratification | 27/09/1977 | |
| ITALY | Signature | 09/04/1975 | |
| ITALY | Ratification | 01/07/1977 | |
| JAPAN | Signature | 09/04/1975 | |
| JAPAN | Acceptance | 31/05/1976 | |
| Land Berlin | Extension | 08/06/1976 | 08/06/1976 |
| LUXEMBOURG | Signature | 09/04/1975 | |
| NETHERLANDS THE | Signature | 09/04/1975 | |
| NETHERLANDS THE | Ratification | 27/06/1977 | |
| NEW ZEALAND | Signature | 09/04/1975 | |
| NEW ZEALAND | Ratification | 02/12/1975 | |
| NEW ZEALAND | Declaration | 02/12/1975 | |
| NORWAY | Signature | 09/04/1975 | |
| NORWAY | Ratification | 19/01/1976 | |
| PORTUGAL | Signature | 09/04/1975 | |
| PORTUGAL | Ratification | 03/05/1976 | |
| SPAIN | Signature | 09/04/1975 | |
| SPAIN | Ratification | 03/12/1976 | |
| SWEDEN | Signature | 09/04/1975 | |
| SWEDEN | Ratification | 23/12/1975 | |
| SWITZERLAND | Signature | 09/04/1975 | |
| SWITZERLAND | Ratification | 10/12/1975 | |
| TURKEY | Signature | 30/05/1975 | |
| TURKEY | Ratification | 02/04/1976 | |
| UNITED KINGDOM | Signature | 09/04/1975 | |
| UNITED KINGDOM | Ratification | 09/03/1976 | |
| UNITED STATES OF AMERICA | Signature | 09/04/1975 | |