| Country | Action | Action Date | Effective Date |
|---|
| ARGENTINA | Acceptance | 18/11/1954 | |
| AUSTRALIA | Withdrawal | | 31/12/1973 |
| AUSTRALIA | Acceptance | 22/03/1954 | |
| AUSTRIA | Acceptance | 25/06/1954 | |
| BELGIUM | Acceptance | 27/04/1955 | |
| BOLIVIA | Acceptance | 01/12/1960 | |
| BRAZIL | Withdrawal | | 31/12/1979 |
| BRAZIL | Acceptance | 28/06/1955 | |
| CANADA | Acceptance | 29/03/1954 | |
| CANADA | Withdrawal | 31/12/1962 | 01/01/1963 |
| CHILE | Acceptance | 20/10/1954 | |
| COLOMBIA | Acceptance | 19/09/1955 | |
| COSTA RICA | Acceptance | 29/03/1955 | |
| CYPRUS | Acceptance | 28/05/1974 | |
| DENMARK | Acceptance | 26/02/1954 | |
| DOMINICAN REPUBLIC | Acceptance | 25/11/1968 | |
| ECUADOR | Acceptance | 12/11/1959 | |
| EL SALVADOR | Acceptance | 25/11/1968 | |
| FRANCE | Withdrawal | | 31/12/1966 |
| FRANCE | Acceptance | 09/09/1955 | |
| GERMANY FEDERAL REPUBLIC | Acceptance | 08/11/1954 | |
| GREECE | Acceptance | 08/07/1954 | |
| HONDURAS | Acceptance | 13/11/1967 | |
| ISRAEL | Acceptance | 01/03/1954 | |
| ITALY | Acceptance | 15/01/1954 | |
| LUXEMBOURG | Acceptance | 18/07/1956 | |
| Malta | Withdrawal | | 30/04/1981 |
| Malta | Acceptance | 12/11/1962 | |
| NETHERLANDS THE | Acceptance | 12/04/1954 | |
| NEW ZEALAND | Withdrawal | | 31/12/1967 |
| NEW ZEALAND | Acceptance | 03/05/1955 | |
| NICARAGUA | Acceptance | 13/11/1967 | |
| NORWAY | Acceptance | 26/11/1954 | |
| PANAMA | Acceptance | 13/11/1958 | |
| PARAGUAY | Acceptance | 29/04/1954 | |
| PERU | Acceptance | 14/11/1966 | |
| PORTUGAL | Acceptance | 17/11/1975 | |
| SOUTH AFRICA | Withdrawal | | 31/12/1980 |
| SOUTH AFRICA | Acceptance | 27/09/1956 | |
| SPAIN | Acceptance | 25/05/1956 | |
| SWEDEN | Withdrawal | 31/12/1961 | |
| SWEDEN | Observation | 18/11/1980 | |
| SWITZERLAND | Acceptance | 07/04/1954 | |
| UNITED KINGDOM | Withdrawal | | 01/01/1969 |
| UNITED KINGDOM | Acceptance | 11/05/1961 | |
| UNITED KINGDOM | Ratification | 11/05/1961 | |
| UNITED KINGDOM | Re-Application | 19/03/2001 | 07/06/2001 |
| UNITED STATES OF AMERICA | Acceptance | 21/09/1954 | |
| URUGUAY | Acceptance | 03/05/1965 | |
| VENEZUELA | Withdrawal | | 31/12/1967 |
| VENEZUELA | Acceptance | 04/12/1973 | |
| VENEZUELA | Membership | 04/12/1973 | |