| Country | Action | Action Date | Effective Date |
|---|
| ARGENTINA | Signature | 14/10/1959 | |
| ARGENTINA | Ratification | 14/10/1959 | |
| Aruba | Ratification | 01/01/1986 | |
| AUSTRIA | Ratification | 10/01/1977 | |
| BAHAMAS | Ratification | 15/12/1977 | |
| Barbados | Ratification | 19/03/1969 | |
| BELGIUM | Signature | 09/07/1976 | |
| BELGIUM | Ratification | 09/07/1976 | |
| BOLIVIA | Signature | 30/12/1959 | |
| BOLIVIA | Ratification | 30/12/1959 | |
| BRAZIL | Signature | 30/12/1959 | |
| BRAZIL | Ratification | 30/12/1959 | |
| CANADA | Ratification | 13/05/1972 | |
| CHILE | Signature | 17/12/1959 | |
| CHILE | Ratification | 17/12/1959 | |
| COLOMBIA | Signature | 21/12/1959 | |
| COLOMBIA | Ratification | 21/12/1959 | |
| COSTA RICA | Signature | 30/12/1959 | |
| COSTA RICA | Ratification | 30/12/1959 | |
| DENMARK | Signature | 09/07/1976 | |
| DENMARK | Ratification | 09/07/1976 | |
| DOMINICAN REPUBLIC | Signature | 16/12/1959 | |
| DOMINICAN REPUBLIC | Ratification | 16/12/1959 | |
| ECUADOR | Ratification | 22/12/1959 | |
| ECUADOR | Signature | 22/12/1959 | |
| EL SALVADOR | Signature | 29/12/1959 | |
| EL SALVADOR | Ratification | 29/12/1959 | |
| FINLAND | Ratification | 30/06/1977 | |
| FRANCE | Ratification | 10/01/1977 | |
| GERMANY FEDERAL REPUBLIC | Signature | 09/07/1976 | |
| GERMANY FEDERAL REPUBLIC | Ratification | 09/07/1976 | |
| GUATEMALA | Signature | 16/12/1959 | |
| GUATEMALA | Ratification | 16/12/1959 | |
| GUYANA | Ratification | 16/11/1976 | |
| HAITI | Signature | 27/10/1959 | |
| HAITI | Ratification | 27/10/1959 | |
| HONDURAS | Signature | 29/12/1959 | |
| HONDURAS | Ratification | 29/12/1959 | |
| ISRAEL | Signature | 09/07/1976 | |
| ISRAEL | Ratification | 09/07/1976 | |
| ITALY | Ratification | 26/05/1977 | |
| JAMAICA | Ratification | 30/12/1969 | |
| JAPAN | Signature | 09/07/1976 | |
| JAPAN | Ratification | 09/07/1976 | |
| MEXICO | Signature | 30/12/1959 | |
| MEXICO | Ratification | 30/12/1959 | |
| Netherlands Antilles | Ratification | 01/01/1986 | |
| NETHERLANDS THE | Ratification | 10/01/1977 | |
| NICARAGUA | Signature | 29/12/1959 | |
| NICARAGUA | Ratification | 29/12/1959 | |
| NORWAY | Ratification | 07/07/1986 | |
| PANAMA | Signature | 29/12/1959 | |
| PANAMA | Ratification | 29/12/1959 | |
| PARAGUAY | Signature | 16/12/1959 | |
| PARAGUAY | Ratification | 16/12/1959 | |
| PERU | Signature | 30/12/1959 | |
| PERU | Ratification | 30/12/1959 | |
| PORTUGAL | Ratification | 25/03/1980 | |
| SPAIN | Signature | 09/07/1976 | |
| SPAIN | Ratification | 09/07/1976 | |
| SURINAME | Ratification | 12/12/1980 | |
| SWEDEN | Ratification | 19/09/1977 | |
| SWITZERLAND | Signature | 09/07/1976 | |
| SWITZERLAND | Ratification | 09/07/1976 | |
| TRINIDAD AND TOBAGO | Ratification | 10/07/1967 | |
| UNITED KINGDOM | Signature | 09/07/1976 | |
| UNITED KINGDOM | Ratification | 09/07/1976 | |
| UNITED KINGDOM | Reservation | 09/07/1976 | |
| UNITED KINGDOM | Withdrawal Res. | 13/10/1976 | 09/07/1976 |
| UNITED STATES OF AMERICA | Signature | 14/10/1959 | |
| UNITED STATES OF AMERICA | Ratification | 14/10/1959 | |
| URUGUAY | Signature | 12/02/1960 | |
| URUGUAY | Ratification | 12/02/1960 | |
| VENEZUELA | Signature | 13/02/1960 | |
| VENEZUELA | Acceptance | 13/02/1960 | |
| YUGOSLAVIA | Signature | 09/07/1976 | |
| YUGOSLAVIA | Ratification | 09/07/1976 | |