| Albania |
1993 |
| Algeria |
1963 |
| Angola |
1977 |
| Antigua and Barbuda |
1986 |
| Argentina |
1953 |
| Australia |
1952 |
| Austria |
1975 |
| Azerbaijan |
1995 |
| Bahamas |
1976 |
| Bahrain |
1976 |
| Bangladesh |
1976 |
| Barbados |
1970 |
| Belgium |
1951 |
| Belize |
1990 |
| Benin |
1980 |
| Bolivia |
1987 |
| Bosnia and Herzegovina |
1993 |
| Brazil |
1963 |
| Brunei Darussalam |
1984 |
| Bulgaria |
1960 |
| Cambodia |
1961 |
| Cameroon |
1961 |
| Canada |
1948 |
| Cape Verde |
1976 |
| Chile |
1972 |
| China |
1973 |
| Colombia |
1974 |
| Congo |
1975 |
| Costa Rica |
1981 |
| Côte d'Ivoire |
1960 |
| Croatia |
1992 |
| Cuba |
1966 |
| Cyprus |
1973 |
| Czech Republic |
1993 |
| Democratic People's Republic of Korea |
1986 |
| Democratic Republic of the Congo |
1973 |
| Denmark |
1959 |
| Djibouti |
1979 |
| Dominica |
1979 |
| Dominican Republic |
1953 |
| Ecuador |
1956 |
| Egypt |
1958 |
| El Salvador |
1981 |
| Equatorial Guinea |
1972 |
| Eritrea |
1993 |
| Estonia |
1992 |
| Ethiopia |
1975 |
| Fiji |
1983 |
| Finland |
1959 |
| France |
1952 |
| Gabon |
1976 |
| Gambia |
1979 |
| Georgia |
1993 |
| Germany |
1959 |
| Ghana |
1959 |
| Greece |
1958 |
| Grenada |
1998 |
| Guatemala |
1983 |
| Guinea |
1975 |
| GuineaBissau |
1977 |
| Guyana |
1980 |
| Haiti |
1953 |
| Honduras |
1954 |
| Hungary |
1970 |
| Iceland |
1960 |
| India |
1959 |
| Indonesia |
1961 |
| Iran (Islamic Republic of) |
1958 |
| Iraq |
1973 |
| Ireland |
1951 |
| Israel |
1952 |
| Italy |
1957 |
| Jamaica |
1976 |
| Japan |
1958 |
| Jordan |
1973 |
| Kazakhstan |
1994 |
| Kenya |
1973 |
| Kuwait |
1960 |
| Latvia |
1993 |
| Lebanon |
1966 |
| Liberia |
1959 |
| Libyan Arab Jamahiriya |
1970 |
| Lithuania |
1995 |
| Luxembourg |
1991 |
| Madagascar |
1961 |
| Malawi |
1989 |
| Malaysia |
1971 |
| Maldives |
1967 |
| Malta |
1966 |
| Marshall Islands |
1998 |
| Mauritania |
1961 |
| Mauritius |
1978 |
| Mexico |
1954 |
| Monaco |
1989 |
| Mongolia |
1996 |
| Morocco |
1962 |
| Mozambique |
1979 |
| Myanmar |
1951 |
| Namibia |
1994 |
| Nepal |
1979 |
| Netherlands |
1949 |
| New Zealand |
1960 |
| Nicaragua |
1982 |
| Nigeria |
1962 |
| Norway |
1958 |
| Oman |
1974 |
| Pakistan |
1958 |
| Panama |
1958 |
| Papua New Guinea |
1976 |
| Paraguay |
1993 |
| Peru |
1968 |
| Philippines |
1964 |
| Poland |
1960 |
| Portugal |
1976 |
| Qatar |
1977 |
| Republic of Korea |
1962 |
| Romania |
1965 |
| Russian Federation |
1958 |
| Saint Lucia |
1980 |
| Saint Vincent and the Grenadines |
1981 |
| Samoa |
1996 |
| Sao Tome and Principe |
1990 |
| Saudi Arabia |
1969 |
| Senegal |
1960 |
| Seychelles |
1978 |
| Sierra Leone |
1973 |
| Singapore |
1966 |
| Slovakia |
1993 |
| Slovenia |
1993 |
| Solomon Islands |
1988 |
| Somalia |
1978 |
| South Africa |
1995 |
| Spain |
1962 |
| Sri Lanka |
1972 |
| Sudan |
1974 |
| Suriname |
1976 |
| Sweden |
1959 |
| Switzerland |
1955 |
| Syrian Arab Republic |
1963 |
| Thailand |
1973 |
| The former Yugoslav Republic of Macedonia |
1993 |
| Togo |
1983 |
| Tonga |
2000 |
| Trinidad and Tobago |
1965 |
| Tunisia |
1963 |
| Turkey |
1958 |
| Turkmenistan |
1993 |
| Ukraine |
1994 |
| United Arab Emirates |
1980 |
| United Kingdom of Great Britain and Northern Ireland |
1949 |
| United Republic of Tanzania |
1974 |
| United States of America |
1950 |
| Uruguay |
1968 |
| Vanuatu |
1986 |
| Venezuela |
1975 |
| Viet Nam |
1984 |
| Yemen |
1979 |
| Yugoslavia |
1960 |
| |
|
| Associate Members: |
|
| Hong Kong, China |
1967 |
| Macao, China |
1990 |
