| Country | Action | Action Date | Effective Date |
|---|---|---|---|
| ANGOLA | Succession | 22/04/1994 | 11/11/1975 |
| Antilles | Extension | 01/01/1986 | 01/01/1986 |
| Aruba | Extension | 01/01/1986 | 01/01/1986 |
| AUSTRALIA | Signature | 02/05/1951 | |
| BAHRAIN | Succession | 17/01/1994 | 15/08/1971 |
| BANGLADESH | Signature | 16/12/1972 | |
| BELGIUM | Signature | 21/04/1951 | |
| BELIZE | Succession | 07/10/1983 | 21/09/1981 |
| BOLIVIA | Participation | 09/08/1990 | 08/09/1990 |
| BRAZIL | Signature | 30/07/1951 | |
| BRUNEI DARUSSALAM | Succession | 03/01/1994 | 31/12/1983 |
| BURMA | Signature | 01/10/1951 | |
| CANADA | Signature | 07/05/1951 | |
| CEYLON | Signature | 21/04/1951 | |
| CHILE | Signature | 24/09/1952 | |
| COSTA RICA | Participation | 25/10/1990 | 24/11/1990 |
| CUBA | Signature | 21/04/1951 | |
| CZECH REPUBLIC | Participation | 15/03/1993 | 16/04/1993 |
| CZECHOSLOVAKIA | Signature | 12/02/1951 | |
| DENMARK | Signature | 20/03/1951 | |
| DJIBOUTI | Succession | 17/04/1995 | 16/12/1994 |
| DOMINICA, COMMONWEALTH OF | Succession | 20/04/1993 | 03/11/1978 |
| DOMINICAN REPUBLIC | Signature | 21/04/1951 | |
| EL SALVADOR | Participation | 22/05/1991 | |
| FINLAND | Signature | 16/12/1950 | |
| FRANCE | Signature | 16/12/1950 | |
| GREECE | Signature | 13/02/1951 | |
| GRENADA | Succession | 09/02/1994 | 07/02/1974 |
| GUATEMALA | Participation | 10/09/1990 | 10/10/1990 |
| GUINEA BISSAU | Succession | 22/04/1994 | 10/09/1974 |
| HAITI | Signature | 16/12/1950 | |
| HONDURAS | Participation | 11/03/1994 | 10/04/1994 |
| HUNGARY | Signature | 09/09/1973 | |
| INDIA | Signature | 23/07/1951 | |
| INDONESIA | Signature | 19/10/1951 | |
| ITALY | Signature | 12/02/1951 | |
| LESOTHO | Succession | 08/01/1998 | 04/10/1966 |
| LIBERIA | Signature | 19/06/1951 | |
| LIECHTENSTEIN | Accession | 22/04/1994 | 23/09/1994 |
| LUXEMBOURG | Signature | 21/04/1951 | |
| Macao | Succession | 11/01/1991 | 11/01/1991 |
| MALI | Succession | 11/01/1993 | 20/06/1960 |
| MOROCCO | Application | 17/06/1987 | |
| MOZAMBIQUE | Succession | 27/07/1992 | 25/06/1975 |
| NAMIBIA | Succession | 15/09/1992 | 21/03/1990 |
| NETHERLANDS THE | Signature | 21/04/1951 | |
| NETHERLANDS THE | Declaration | 01/01/1986 | 01/01/1986 |
| NEW ZEALAND | Signature | 05/07/1951 | |
| NICARAGUA | Signature | 30/06/1953 | |
| NORWAY | Signature | 03/07/1951 | |
| PAKISTAN | Signature | 26/04/1951 | |
| Papua New Guinea | Application | 04/08/1975 | 03/09/1975 |
| PAPUA NEW GUINEA | Succession | 17/04/1995 | 16/12/1994 |
| PARAGUAY | Participation | 07/12/1993 | 06/01/1994 |
| QATAR | Succession | 22/04/1994 | 03/09/1971 |
| SAINT LUCIA | Succession | 13/04/1993 | 22/02/1979 |
| SINGAPORE | Succession | 08/10/1973 | 09/08/1965 |
| SLOVAK REPUBLIC | Participation | 16/03/1993 | 01/01/1993 |
| SLOVENIA | Participation | 30/09/1994 | 20/10/1994 |
| SOLOMON ISLANDS | Succession | 28/12/1994 | 07/07/1978 |
| SOUTH AFRICA | Signature | 18/06/1951 | |
| Southern Rhodesia | Signature | 16/12/1950 | |
| ST KITTS AND NEVIS | Succession | 22/04/1994 | 19/09/1983 |
| ST VINCENT AND THE GRENADINES | Succession | 18/05/1993 | 27/10/1979 |
| SURINAME | Succession | 25/02/1978 | 25/11/1975 |
| SWAZILAND | Succession | 08/02/1993 | 06/09/1968 |
| SWEDEN | Signature | 16/12/1950 | |
| TUNISIA | Participation | 20/07/1990 | 19/08/1990 |
| UNITED ARAB EMIRATES | Succession | 08/03/1994 | 01/12/1971 |
| UNITED KINGDOM | Signature | 04/04/1951 | |
| UNITED STATES OF AMERICA | Signature | 20/04/1951 | |
| VENEZUELA | Participation | 31/08/1990 |