| Contracting Parties/Signatories | Signature | Instrument | In Force | Details |
|---|---|---|---|---|
| Canada | December 17, 1992 | Ratification : December 8, 1993 | January 1, 1994 | |
| Mexico | December 17, 1992 | Ratification : December 8, 1993 | January 1, 1994 | |
| United States of America | December 17, 1992 | Ratification : December 8, 1993 | January 1, 1994 |