| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| ALGERIA | Adherence | 16/02/2001 | 16/02/2001 |
| ANGOLA | Accession | 29/07/1976 | 29/07/1976 |
| Anguilla | Extension | 10/11/1995 | 10/11/1995 |
| BENIN | Accession | 09/01/1978 | 09/01/1978 |
| Bermuda | Extension | 10/11/1995 | 10/11/1995 |
| Bermuda | Extension | 21/10/2020 | 21/10/2020 |
| BRAZIL | Signature | 14/05/1966 | |
| BRAZIL | Ratification | 01/04/1969 | 01/04/1969 |
| British Virgin Islands | Extension | 21/10/2020 | 21/10/2020 |
| CANADA | Accession | 20/08/1968 | 21/03/1969 |
| CAPE VERDE | Accession | 11/10/1979 | 11/10/1979 |
| CUBA | Accession | 15/01/1975 | 15/01/1975 |
| DOMINICAN REPUBLIC | Signature | 13/02/1968 | |
| EQUATORIAL GUINEA | Accession | 13/05/1987 | 13/05/1987 |
| FRANCE | Accession | 07/11/1968 | 21/03/1969 |
| GABON | Signature | 09/08/1967 | |
| GABON | Ratification | 19/09/1977 | 21/03/1969 |
| GHANA | Accession | 17/04/1968 | 21/03/1969 |
| HONDURAS | Adherence | 30/01/2001 | 30/01/2001 |
| IVORY COAST | Accession | 06/12/1972 | 06/12/1972 |
| JAPAN | Signature | 28/10/1966 | |
| JAPAN | Ratification | 24/08/1967 | 21/03/1969 |
| Jersey, Bailiwick of | Extension | 16/07/2025 | 16/07/2025 |
| KOREA REPUBLIC OF | Signature | 31/05/1966 | |
| KOREA REPUBLIC OF | Ratification | 28/08/1970 | 28/08/1970 |
| MOROCCO | Accession | 26/09/1969 | 26/09/1969 |
| NAMIBIA | Signature | 28/04/1999 | |
| PANAMA | Adherence | 28/12/1999 | 28/12/1999 |
| PORTUGAL | Accession | 03/09/1969 | 03/09/1969 |
| SAO TOME AND PRINCIPE | Adherence | 15/09/1983 | 15/09/1983 |
| SENEGAL | Accession | 25/08/1971 | 25/08/1971 |
| SENEGAL | Withdrawal | 12/03/1987 | 31/12/1988 |
| SOUTH AFRICA | Accession | 17/10/1967 | 21/03/1969 |
| SOVIET UNION | Accession | 07/01/1977 | 07/01/1977 |
| SOVIET UNION | Declaration | 07/01/1977 | |
| SPAIN | Signature | 14/05/1966 | |
| SPAIN | Ratification | 21/03/1969 | 21/03/1969 |
| St Helena, Ascension & Tristan | Extension | 21/10/2020 | 21/10/2020 |
| TRINIDAD AND TOBAGO | Adherence | 30/03/1999 | 30/03/1999 |
| Turks And Caicos Islands | Extension | 10/11/1995 | 10/11/1995 |
| Turks And Caicos Islands | Extension | 21/10/2020 | 21/10/2020 |
| UNITED KINGDOM | Adherence | 10/11/1995 | 10/11/1995 |
| UNITED KINGDOM | Notification | 19/01/1998 | |
| UNITED KINGDOM | Adherence | 21/10/2020 | 21/10/2020 |
| UNITED STATES OF AMERICA | Signature | 14/05/1966 | |
| UNITED STATES OF AMERICA | Ratification | 18/05/1967 | 21/03/1969 |
| URUGUAY | Accession | 16/03/1983 | 16/03/1983 |
| VENEZUELA | Signature | 09/09/1970 | |
| VENEZUELA | Ratification | 17/11/1983 | 17/11/1983 |