| Contracting Parties/Signatories | Signature | Instrument | In Force | Details |
|---|
| Argentina | August 12, 1980 | Ratification: February 10, 1981 | March 18, 1981 | |
| Bolivia (Plurinational State of) | August 12, 1980 | Ratification: March 17, 1982 | April 16, 1982 | |
| Brazil | August 12, 1980 | Ratification: January 15, 1982 | February 14, 1982 | |
| Chile | August 12, 1980 | Ratification: June 18, 1981 | July 18, 1981 | |
| Colombia | August 12, 1980 | Ratification: July 20, 1981 | August 19, 1981 | |
| Cuba | | | August 25, 1999 | |
| Ecuador | August 12, 1980 | Ratification: March 17, 1982 | April 16, 1982 | |
| Mexico | August 12, 1980 | Ratification: February 20, 1981 | March 22, 1981 | |
| Paraguay | August 12, 1980 | Ratification: February 16, 1981 | March 18, 1981 | |
| Peru | August 12, 1980 | Ratification: January 8, 1982 | February 7, 1982 | |
| Uruguay | August 12, 1980 | Ratification: October 22, 1980 | March 18, 1981 | |
| Venezuela (Bolivarian Republic of) | August 12, 1980 | Ratification: March 17, 1982 | April 16, 1982 | |
