| Contracting Parties/Signatories | Signature | Instrument | In Force | Details |
|---|
| Albania | | Accession: May 13, 2009 | June 1, 2010 | |
| Argentina | | Accession: July 19, 1983 | January 1, 1988 | Details |
| Armenia | | Accession: December 2, 2008 | January 1, 2010 | Details |
| Australia | | Accession: March 17, 1988 | April 1, 1989 | Details |
| Austria | April 11, 1980 | Ratification: December 29, 1987 | January 1, 1989 | |
| Belarus | | Accession: October 9, 1989 | November 1, 1990 | Details |
| Belgium | | Accession: October 31, 1996 | November 1, 1997 | |
| Benin | | Accession: July 29, 2011 | August 1, 2012 | |
| Bosnia and Herzegovina | | Accession: January 12, 1994 | March 6, 1992 | |
| Brazil | | Accession: March 4, 2013 | April 1, 2013 | |
| Bulgaria | | Accession: July 9, 1990 | August 1, 1991 | |
| Burundi | | Accession: September 4, 1998 | October 1, 1999 | |
| Canada | | Accession: April 23, 1991 | May 1, 1992 | Details |
| Chile | April 11, 1980 | Ratification: February 7, 1990 | March 1, 1991 | Details |
| China | September 30, 1981 | Ratification: December 11, 1986 | January 1, 1988 | Details |
| Colombia | | Accession: July 10, 2001 | August 1, 2002 | |
| Croatia | | Declaration / Notification of Succession: June 8, 1998 | October 8, 1991 | |
| Cuba | | Accession: November 2, 1994 | December 1, 1995 | |
| Cyprus | | Accession: March 7, 2005 | April 1, 2006 | |
| Czech Republic | | Declaration / Notification of Succession: September 30, 1993 | January 1, 1993 | Details |
| Denmark | May 26, 1981 | Ratification: February 14, 1989 | March 1, 1990 | Details |
| Dominican Republic | | Accession: June 7, 2010 | July 1, 2011 | |
| Ecuador | | Accession: January 27, 1992 | February 1, 1993 | |
| Egypt | | Accession: December 6, 1982 | January 1, 1988 | |
| El Salvador | | Accession: November 27, 2006 | December 1, 2007 | |
| Estonia | | Accession: September 20, 1993 | October 1, 1994 | Details |
| Finland | May 26, 1981 | Ratification: December 15, 1987 | January 1, 1989 | Details |
| France | August 27, 1981 | Ratification: August 6, 1982 | January 1, 1988 | |
| Gabon | | Accession: December 15, 2004 | January 1, 2006 | |
| Georgia | | Accession: August 16, 1994 | September 1, 1995 | |
| Germany | May 26, 1981 | Ratification: December 21, 1989 | January 1, 1991 | Details |
| Ghana | April 11, 1980 | | | |
| Greece | | Accession: January 12, 1998 | February 1, 1999 | |
| Guinea | | Accession: January 23, 1991 | February 1, 1992 | |
| Honduras | | Accession: October 10, 2002 | November 1, 2003 | |
| Hungary | April 11, 1980 | Ratification: June 16, 1983 | January 1, 1988 | Details |
| Iceland | | Accession: May 10, 2001 | June 1, 2002 | Details |
| Iraq | | Accession: March 5, 1990 | April 1, 1991 | |
| Israel | | Accession: January 22, 2002 | February 1, 2003 | |
| Italy | September 30, 1981 | Ratification: December 11, 1986 | January 1, 1988 | |
| Japan | | Accession: July 1, 2008 | August 1, 2009 | |
| Kyrgyzstan | | Accession: May 11, 1999 | June 1, 2000 | |
| Latvia | | Accession: July 31, 1997 | August 1, 1998 | Details |
| Lebanon | | Accession: November 21, 2008 | December 1, 2009 | |
| Lesotho | June 18, 1981 | Ratification: June 18, 1981 | January 1, 1988 | |
| Liberia | | Accession: September 16, 2005 | October 1, 2006 | |
| Lithuania | | Accession: January 18, 1995 | February 1, 1996 | Details |
| Luxembourg | | Accession: January 30, 1997 | February 1, 1998 | |
| Mauritania | | Accession: August 20, 1999 | September 1, 2000 | |
| Mexico | | Accession: December 29, 1987 | January 1, 1989 | |
| Mongolia | | Accession: December 31, 1997 | January 1, 1999 | |
| Montenegro | | Declaration / Notification of Succession: October 23, 2006 | June 3, 2006 | |
| Netherlands | May 29, 1981 | Ratification: December 13, 1990 | January 1, 1992 | |
| New Zealand | | Accession: September 22, 1994 | October 1, 1995 | |
| Norway | May 26, 1981 | Ratification: July 20, 1988 | August 1, 1989 | Details |
| Paraguay | | Accession: January 13, 2006 | February 1, 2007 | Details |
| Peru | | Accession: March 25, 1999 | April 1, 2000 | |
| Poland | September 28, 1981 | Ratification: May 19, 1995 | June 1, 1996 | |
| Republic of Korea | | Accession: February 17, 2004 | March 1, 2005 | |
| Republic of Moldova | | Accession: October 13, 1994 | November 1, 1995 | |
| Romania | | Accession: May 22, 1991 | June 1, 1992 | |
| Russian Federation | | Accession: August 16, 1990 | September 1, 1991 | Details |
| Saint Vincent and the Grenadines | | Accession: September 12, 2000 | October 1, 2001 | Details |
| San Marino | | Accession: February 22, 2012 | March 1, 2013 | |
| Serbia | | Declaration / Notification of Succession: March 12, 2001 | April 27, 1992 | |
| Singapore | April 11, 1980 | Ratification: February 16, 1995 | March 1, 1996 | Details |
| Slovakia | | Declaration / Notification of Succession: May 28, 1993 | January 1, 1993 | Details |
| Slovenia | | Declaration / Notification of Succession: January 7, 1994 | June 25, 1991 | |
| Spain | | Accession: July 24, 1990 | August 1, 1991 | |
| Sweden | May 26, 1981 | Ratification: December 15, 1987 | January 1, 1989 | Details |
| Switzerland | | Accession: February 21, 1990 | March 1, 1991 | |
| Syrian Arab Republic | | Accession: October 19, 1982 | January 1, 1988 | |
| the former Yugoslav Republic of Macedonia | | Declaration / Notification of Succession: November 22, 2006 | November 17, 1991 | |
| Turkey | | Accession: July 7, 2010 | August 1, 2011 | |
| Uganda | | Accession: February 12, 1992 | March 1, 1993 | |
| Ukraine | | Accession: January 3, 1990 | February 1, 1991 | Details |
| United States of America | August 31, 1981 | Ratification: December 11, 1986 | January 1, 1988 | Details |
| Uruguay | | Accession: January 25, 1999 | February 1, 2000 | |
| Uzbekistan | | Accession: November 27, 1996 | December 1, 1997 | |
| Venezuela (Bolivarian Republic of) | September 28, 1981 | | | |
| Zambia | | Accession: June 6, 1986 | January 1, 1988 | |
