| Contracting Parties | Signature | Ratification (Instrument deposited on) |
Entry into force |
| GERMANY | 05.09.1980 | / | / |
| AUSTRIA | 05.09.1980 | / | / |
| BELGIUM | 05.09.1980 | / | / |
| SPAIN | 05.09.1980 | 12.08.1985 | 01.01.1990 |
| GREECE | 05.09.1980 | / | / |
| ITALY | 05.09.1980 | 24.04.1985 | 01.01.1990 |
| LUXEMBOURG | 05.09.1980 | / | / |
| NETHERLANDS | 05.09.1980 | 10.10.1989 | 01.01.1990 |
| PORTUGAL | 05.09.1980 | 03.07.1990 | 01.10.1990 |