| Contracting Parties | Signature | Ratification (Instrument deposited on) |
Entry into force |
| GERMANY | 15.09.1977 | / | / |
| + AUSTRIA | 15.09.1977 | 23.04.1982 | 01.07.1982 |
| BELGIUM | 15.09.1977 | / | / |
| SPAIN | 15.09.1977 | 19.02.1981 | 01.05.19811 |
| FRANCE | 15.09.1977 | 14.05.1982 | 01.08.1982 |
| GREECE | 15.09.1977 | 21.03.2014 | 01.06.2014 |
| ITALY | 15.09.1977 | 09.12.1981 | 01.03.1982 |
| LUXEMBOURG | 15.09.1977 | 05.08.1981 | 01.11.1981 |
| NETHERLANDS | 15.09.1977 | 09.06.1978 | 01.05.1981 |
| PORTUGAL | 15.09.1977 | 20.11.1984 | 01.02.1985 |
| SWITZERLAND | 15.09.1977 | / | / |
| TURKEY | 15.09.1977 | 01.05.1987 | 01.08.1987 |
| + POLAND | 15.09.1977 | 28.03.2003 | 01.06.2003 |
| + accession |