| Country | Action | Action Date | Effective Date |
|---|
| ARGENTINA | Signature | 23/02/1968 | |
| BELGIUM | Signature | 23/02/1968 | |
| BELGIUM | Ratification | 06/09/1978 | 06/12/1978 |
| Bermuda | Extension | 01/11/1980 | 01/02/1981 |
| British Antarctic Territory | Extension | 20/10/1983 | 20/01/1984 |
| British Virgin Islands | Extension | 20/10/1983 | 20/01/1984 |
| CAMEROON | Signature | 26/04/1968 | |
| CANADA | Signature | 23/02/1968 | |
| Cayman Islands | Extension | 20/10/1983 | 20/01/1984 |
| CHINA | Signature | 23/02/1968 | |
| CONGO | Signature | 23/02/1968 | |
| CROATIA | Accession | 29/10/1998 | 28/01/1999 |
| DENMARK | Signature | 20/11/1975 | |
| DENMARK | Ratification | 20/11/1975 | |
| ECUADOR | Accession | 23/03/1977 | 23/06/1977 |
| EGYPT | Signature | 04/06/1973 | |
| EGYPT | Ratification | 31/01/1983 | 30/04/1983 |
| Falkland Island Dependencies | Extension | 20/10/1983 | 20/01/1984 |
| Falkland Islands | Extension | 20/10/1983 | 20/01/1984 |
| FINLAND | Signature | 23/02/1968 | |
| FINLAND | Ratification | 01/12/1984 | 01/03/1985 |
| FRANCE | Signature | 04/12/1968 | |
| FRANCE | Ratification | 10/03/1977 | |
| GEORGIA | Accession | 20/02/1996 | 20/05/1996 |
| GERMAN DEMOCRATIC REPUBLIC | Accession | 14/02/1979 | 14/05/1979 |
| GERMAN DEMOCRATIC REPUBLIC | Notification | 03/01/1997 | |
| GERMANY FEDERAL REPUBLIC | Signature | 23/02/1968 | |
| GERMANY FEDERAL REPUBLIC | Notification | 03/01/1997 | |
| Gibraltar | Extension | 22/09/1977 | 22/12/1977 |
| GREECE | Signature | 23/02/1968 | |
| Hong Kong | Extension | 01/11/1980 | 01/02/1981 |
| HONG KONG SAR | Application | 04/06/1997 | 01/07/1997 |
| IRELAND, REPUBLIC OF | Signature | 15/04/1998 | |
| Isle of Man | Extension | 01/10/1976 | |
| ITALY | Signature | 23/02/1968 | |
| ITALY | Ratification | 22/08/1985 | 22/11/1985 |
| ITALY | Declaration | 22/08/1985 | |
| LAO PEOPLE'S DEMOCRATIC REPUBLIC | | | |
| LATVIA | Accession | 04/04/2002 | 04/10/2002 |
| LEBANON | Accession | 19/07/1975 | 23/06/1977 |
| LIBERIA | Signature | 23/02/1968 | |
| LITHUANIA | Accession | 02/12/2003 | 02/06/2004 |
| LUXEMBOURG | Accession | 18/02/1991 | 18/05/1991 |
| MAURITANIA | Signature | 23/02/1968 | |
| Montserrat | Extension | 20/10/1983 | 20/10/1984 |
| NETHERLANDS THE | Signature | 05/02/1979 | |
| NETHERLANDS THE | Ratification | 26/04/1982 | 26/07/1982 |
| NETHERLANDS THE | Extension | 08/08/1986 | |
| NORWAY | Signature | 13/04/1973 | |
| NORWAY | Ratification | 19/03/1974 | 23/06/1977 |
| PARAGUAY | Signature | 30/04/1968 | |
| PHILIPPINES | Signature | 23/02/1968 | |
| POLAND | Signature | 23/02/1968 | |
| POLAND | Ratification | 12/02/1980 | 12/05/1980 |
| POLAND | Reservation | 12/02/1980 | |
| POLAND | Withdrawal Res. | 24/06/1997 | |
| SINGAPORE | Accession | 25/04/1972 | 23/06/1977 |
| SPAIN | Signature | 23/08/1972 | |
| SPAIN | Denunciation | 07/10/2011 | |
| SRI LANKA | Accession | 21/10/1981 | 21/01/1982 |
| SWEDEN | Signature | 23/02/1968 | |
| SWEDEN | Ratification | 09/12/1974 | 23/06/1974 |
| SWITZERLAND | Signature | 23/02/1968 | |
| SWITZERLAND | Ratification | 11/12/1975 | |
| SYRIA | Accession | 01/08/1974 | 23/06/1977 |
| TONGA | Accession | 13/06/1978 | 13/09/1978 |
| Turks And Caicos Islands | Extension | 20/10/1983 | 20/01/1984 |
| UNITED KINGDOM | Signature | 23/02/1968 | |
| UNITED KINGDOM | Ratification | 01/10/1976 | |
| UNITED STATES OF AMERICA | Signature | 23/02/1968 | |
| URUGUAY | Signature | 23/02/1968 | |
| VATICAN CITY | Signature | 23/02/1968 | |