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| Contracting Party | Signature | Instrument | In Force |
| Albania | Accession: December 2, 1993 | March 6, 1994 | |
| Algeria | Accession: January 19, 1998 | April 19, 1998 | |
| Andorra | Accession: March 2, 2004 | June 2, 2004 | |
| Antigua and Barbuda | Accession: December 17, 1999 | March 17, 2000 | |
| Argentina | Accession: May 5, 1967 | June 10, 1967 | |
| Armenia | Accession: July 19, 2000 | October 19, 2000 | |
| Australia | Declaration of Continued Application: April 14, 1928 | April 14, 1928 | |
| Austria | Accession: September 11, 1920 | October 1, 1920 | |
| Azerbaijan | Accession: March 4, 1999 | June 4, 1999 | |
| Bahamas | Declaration of Continued Application: July 5, 1976 | July 10, 1973 | |
| Bahrain | Accession: November 29, 1996 | March 2, 1997 | |
| Bangladesh | Accession: February 4, 1999 | May 4, 1999 | |
| Barbados | Accession: March 16, 1983 | July 30, 1983 | |
| Belarus | Accession: September 12, 1997 | December 12, 1997 | |
| Belgium | September 9, 1886 | Ratification: September 5, 1887 | December 5, 1887 |
| Belize | Accession: March 17, 2000 | June 17, 2000 | |
| Benin | Declaration of Continued Application: January 3, 1961 | January 3, 1961 | |
| Bhutan | Accession: August 25, 2004 | November 25, 2004 | |
| Bolivia (Plurinational State of) | Accession: August 4, 1993 | November 4, 1993 | |
| Bosnia and Herzegovina | Declaration of Continued Application: June 2, 1993 | March 1, 1992 | |
| Botswana | Accession: January 15, 1998 | April 15, 1998 | |
| Brazil | Accession: February 6, 1922 | February 9, 1922 | |
| Brunei Darussalam | Accession: May 30, 2006 | August 30, 2006 | |
| Bulgaria | Accession: December 5, 1921 | December 5, 1921 | |
| Burkina Faso | Accession: April 26, 1963 | August 19, 1963 | |
| Cameroon | Declaration of Continued Application: September 21, 1964 | September 21, 1964 | |
| Canada | Declaration of Continued Application: April 10, 1928 | April 10, 1928 | |
| Cape Verde | Accession: April 7, 1997 | July 7, 1997 | |
| Central African Republic | Accession: May 31, 1977 | September 3, 1977 | |
| Chad | Accession: August 4, 1971 | November 25, 1971 | |
| Chile | Accession: April 9, 1970 | June 5, 1970 | |
| China | Accession: July 10, 1992 | October 15, 1992 | |
| Colombia | Accession: December 4, 1987 | March 7, 1988 | |
| Comoros | Accession: January 17, 2005 | April 17, 2005 | |
| Congo | Declaration of Continued Application: May 8, 1962 | May 8, 1962 | |
| Costa Rica | Accession: March 3, 1978 | June 10, 1978 | |
| Côte d'Ivoire | Accession: July 8, 1961 | January 1, 1962 | |
| Croatia | Declaration / Notification of Succession: July 28, 1992 | October 8, 1991 | |
| Cuba | Accession: November 20, 1996 | February 20, 1997 | |
| Cyprus | Declaration of Continued Application: February 24, 1964 | February 24, 1964 | |
| Czech Republic | Declaration of Continued Application: December 18, 1992 | January 1, 1993 | |
| Democratic People's Republic of Korea | Accession: January 28, 2003 | April 28, 2003 | |
| Democratic Republic of the Congo | Declaration of Continued Application: October 8, 1963 | October 8, 1963 | |
| Denmark | Accession: June 13, 1903 | July 1, 1903 | |
| Djibouti | Accession: February 13, 2002 | May 13, 2002 | |
| Dominica | Accession: May 7, 1999 | August 7, 1999 | |
| Dominican Republic | Accession: September 24, 1997 | December 24, 1997 | |
| Ecuador | Accession: July 8, 1991 | October 9, 1991 | |
| Egypt | Accession: March 2, 1977 | June 7, 1977 | |
| El Salvador | Accession: November 18, 1993 | February 19, 1994 | |
| Equatorial Guinea | Accession: March 26, 1997 | June 26, 1997 | |
| Estonia | Accession: July 26, 1994 | October 26, 1994 | |
| Fiji | Declaration of Continued Application: December 1, 1971 | December 1, 1971 | |
| Finland | Accession: March 23, 1928 | April 1, 1928 | |
| France | September 9, 1886 | Ratification: September 5, 1887 | December 5, 1887 |
| Gabon | Accession: December 19, 1961 | March 26, 1962 | |
| Gambia | Accession: December 7, 1992 | March 7, 1993 | |
| Georgia | Accession: February 16, 1995 | May 16, 1995 | |
| Germany | September 9, 1886 | Ratification: September 5, 1887 | December 5, 1887 |
| Ghana | Accession: July 11, 1991 | October 11, 1991 | |
| Greece | Accession: November 9, 1920 | November 9, 1920 | |
| Grenada | Accession: June 22, 1998 | September 22, 1998 | |
| Guatemala | Accession: April 28, 1997 | July 28, 1997 | |
| Guinea | Accession: August 13, 1980 | November 20, 1980 | |
| Guinea-Bissau | Accession: April 18, 1991 | July 22, 1991 | |
| Guyana | Accession: July 25, 1994 | October 25, 1994 | |
| Haiti | Accession: October 11, 1995 | January 11, 1996 | |
| Holy See | Accession: July 19, 1935 | September 12, 1935 | |
| Honduras | Accession: October 24, 1989 | January 25, 1990 | |
| Hungary | Accession: February 14, 1922 | February 14, 1922 | |
| Iceland | Accession: June 30, 1947 | September 7, 1947 | |
| India | Declaration of Continued Application: April 23, 1928 | April 1, 1928 | |
| Indonesia | Accession: June 5, 1997 | September 5, 1997 | |
| Ireland | Accession: October 5, 1927 | October 5, 1927 | |
| Israel | Accession: December 14, 1949 | March 24, 1950 | |
| Italy | September 9, 1886 | Ratification: September 5, 1887 | December 5, 1887 |
| Jamaica | Accession: September 28, 1993 | January 1, 1994 | |
| Japan | Accession: April 18, 1899 | July 15, 1899 | |
| Jordan | Accession: April 28, 1999 | July 28, 1999 | |
| Kazakhstan | Accession: January 12, 1999 | April 12, 1999 | |
| Kenya | Accession: March 11, 1993 | June 11, 1993 | |
| Kyrgyzstan | Accession: April 8, 1999 | July 8, 1999 | |
| Lao People's Democratic Republic | Accession: December 14, 2011 | March 14, 2012 | |
| Latvia | Accession: May 11, 1995 | August 11, 1995 | |
| Lebanon | Accession: February 19, 1946 | September 30, 1947 | |
| Lesotho | Accession: June 27, 1989 | September 28, 1989 | |
| Liberia | Accession: December 8, 1988 | March 8, 1989 | |
| Libya | Accession: June 28, 1976 | September 28, 1976 | |
| Liechtenstein | Accession: July 20, 1931 | July 30, 1931 | |
| Lithuania | Accession: September 14, 1994 | December 14, 1994 | |
| Luxembourg | Accession: June 20, 1888 | June 20, 1888 | |
| Madagascar | Declaration of Continued Application: February 11, 1966 | January 1, 1966 | |
| Malawi | Accession: July 12, 1991 | October 12, 1991 | |
| Malaysia | Accession: June 28, 1990 | October 1, 1990 | |
| Mali | Declaration of Continued Application: March 19, 1962 | March 19, 1962 | |
| Malta | Declaration of Continued Application: May 29, 1968 | September 21, 1964 | |
| Mauritania | Accession: October 16, 1972 | February 6, 1973 | |
| Mauritius | Accession: February 9, 1989 | May 10, 1989 | |
| Mexico | Accession: May 9, 1967 | June 11, 1967 | |
| Micronesia (Federated States of) | Accession: July 7, 2003 | October 7, 2003 | |
| Monaco | Accession: May 30, 1889 | May 30, 1889 | |
| Mongolia | Accession: December 12, 1997 | March 12, 1998 | |
| Montenegro | Declaration of Continued Application: December 4, 2006 | June 3, 2006 | |
| Morocco | Accession: June 16, 1917 | June 16, 1917 | |
| Namibia | Declaration of Continued Application: September 21, 1993 | March 21, 1990 | |
| Nepal | Accession: October 11, 2005 | January 11, 2006 | |
| Netherlands | Accession: October 9, 1912 | November 1, 1912 | |
| New Zealand | Declaration of Continued Application: April 26, 1928 | April 24, 1928 | |
| Nicaragua | Accession: May 23, 2000 | August 23, 2000 | |
| Niger | Declaration of Continued Application: May 2, 1962 | May 2, 1962 | |
| Nigeria | Accession: June 10, 1993 | September 14, 1993 | |
| Norway | Accession: April 13, 1896 | April 13, 1896 | |
| Oman | Accession: April 14, 1999 | July 14, 1999 | |
| Pakistan | Accession: June 4, 1948 | July 5, 1948 | |
| Panama | Accession: March 8, 1996 | June 8, 1996 | |
| Paraguay | Accession: September 9, 1991 | January 2, 1992 | |
| Peru | Accession: May 20, 1988 | August 20, 1988 | |
| Philippines | Accession: June 29, 1950 | August 1, 1951 | |
| Poland | Accession: January 28, 1920 | January 28, 1920 | |
| Portugal | Accession: March 29, 1911 | March 29, 1911 | |
| Qatar | Accession: April 5, 2000 | July 5, 2000 | |
| Republic of Korea | Accession: May 21, 1996 | August 21, 1996 | |
| Republic of Moldova | Accession: August 1, 1995 | November 2, 1995 | |
| Romania | Accession: August 28, 1926 | January 1, 1927 | |
| Russian Federation | Accession: December 9, 1994 | March 13, 1995 | |
| Rwanda | Accession: November 3, 1983 | March 1, 1984 | |
| Saint Kitts and Nevis | Accession: January 3, 1995 | April 9, 1995 | |
| Saint Lucia | Accession: May 21, 1993 | August 24, 1993 | |
| Saint Vincent and the Grenadines | Accession: May 29, 1995 | August 29, 1995 | |
| Samoa | Accession: April 21, 2006 | July 21, 2006 | |
| Saudi Arabia | Accession: December 11, 2003 | March 11, 2004 | |
| Senegal | Accession: June 30, 1962 | August 25, 1962 | |
| Serbia | Declaration of Continued Application: September 19, 2006 | April 27, 1992 | |
| Singapore | Accession: September 21, 1998 | December 21, 1998 | |
| Slovakia | Declaration of Continued Application: December 30, 1992 | January 1, 1993 | |
| Slovenia | Declaration of Continued Application: June 12, 1992 | June 25, 1991 | |
| South Africa | Declaration of Continued Application: October 3, 1928 | October 3, 1928 | |
| Spain | September 9, 1886 | Ratification: September 5, 1887 | December 5, 1887 |
| Sri Lanka | Declaration of Continued Application: July 20, 1959 | July 20, 1959 | |
| Sudan | Accession: September 28, 2000 | December 28, 2000 | |
| Suriname | Accession: November 16, 1976 | February 23, 1977 | |
| Swaziland | Accession: September 14, 1998 | December 14, 1998 | |
| Sweden | Accession: July 8, 1904 | August 1, 1904 | |
| Switzerland | September 9, 1886 | Ratification: September 5, 1887 | December 5, 1887 |
| Syrian Arab Republic | Accession: March 11, 2004 | June 11, 2004 | |
| Tajikistan | Accession: December 9, 1999 | March 9, 2000 | |
| Thailand | Accession: June 17, 1931 | July 17, 1931 | |
| the former Yugoslav Republic of Macedonia | Declaration / Notification of Succession: July 23, 1993 | September 8, 1991 | |
| Togo | Accession: January 28, 1975 | April 30, 1975 | |
| Tonga | Accession: March 14, 2001 | June 14, 2001 | |
| Trinidad and Tobago | Accession: May 16, 1988 | August 16, 1988 | |
| Tunisia | September 9, 1886 | Ratification: September 5, 1887 | December 5, 1887 |
| Turkey | Accession: October 27, 1951 | January 1, 1952 | |
| Ukraine | Accession: July 25, 1995 | October 25, 1995 | |
| United Arab Emirates | Accession: April 14, 2004 | July 14, 2004 | |
| United Kingdom | September 9, 1886 | Ratification: September 5, 1887 | December 5, 1887 |
| United Republic of Tanzania | Accession: April 25, 1994 | July 25, 1994 | |
| United States of America | Accession: November 16, 1988 | March 1, 1989 | |
| Uruguay | Accession: June 7, 1967 | July 10, 1967 | |
| Uzbekistan | Accession: January 19, 2005 | April 19, 2005 | |
| Vanuatu | Accession: September 27, 2012 | December 27, 2012 | |
| Venezuela (Bolivarian Republic of) | Accession: September 20, 1982 | December 30, 1982 | |
| Viet Nam | Accession: July 26, 2004 | October 26, 2004 | |
| Yemen | Accession: April 14, 2008 | July 14, 2008 | |
| Zambia | Accession: September 13, 1991 | January 2, 1992 | |
| Zimbabwe | Declaration / Notification of Succession: September 18, 1981 | April 18, 1980 |