| Contracting Parties/Signatories | Signature | Instrument | In Force | Details |
| Belgium | December 15, 1989 | | | |
| Denmark | December 21, 1989 | Ratification: May 7, 1993 | | |
| France | December 15, 1989 | Ratification: February 21, 1992 | | |
| Germany | December 21, 1989 | Ratification: March 18, 1992 | | |
| Greece | December 18, 1989 | Ratification: June 1, 1992 | | |
| Ireland | December 15, 1989 | | | |
| Italy | December 15, 1989 | | | |
| Luxembourg | December 15, 1989 | Ratification: November 15, 1994 | | |
| Netherlands | December 15, 1989 | Ratification: November 18, 1996 | | |
| Portugal | December 15, 1989 | | | |
| Spain | December 15, 1989 | | | |
| United Kingdom | December 15, 1989 | Ratification: May 12, 1995 | | |