| Contracting Parties/Signatories | Signature | Instrument | In Force | Details |
|---|---|---|---|---|
| Belgium | December 4, 1989 | |||
| Denmark | July 13, 1989 | Ratification : July 13, 1989 | Details | |
| France | December 19, 1989 | Ratification : December 19, 1989 | Details | |
| Germany | July 5, 1989 | Ratification : December 28, 1989 | Details | |
| Norway | December 28, 1989 | Ratification : December 28, 1989 | Details | |
| Sweden | October 31, 1989 | Ratification : October 31, 1989 | Details | |
| Türkiye | April 20, 1989 | Ratification : November 24, 1989 | ||
| United Kingdom | December 18, 1989 | Ratification : December 18, 1989 | Details |