| Participant | Signature | Ratification, Acceptance (A), Approval (AA), Accession (a) |
| Albania | 25 Jun 1998 | 27 Jun 2001 |
| Armenia | 25 Jun 1998 | 1 Aug 2001 |
| Austria | 25 Jun 1998 | |
| Azerbaijan | 23 Mar 2000 a | |
| Belarus | 16 Dec 1998 | 9 Mar 2000 AA |
| Belgium | 25 Jun 1998 | 21 Jan 2003 |
| Bulgaria | 25 Jun 1998 | 17 Dec 2003 |
| Croatia | 25 Jun 1998 | |
| Cyprus | 25 Jun 1998 | 19 Sep 2003 |
| Czech Republic | 25 Jun 1998 | 6 Jul 2004 |
| Denmark | 25 Jun 1998 | 29 Sep 2000 AA |
| Estonia | 25 Jun 1998 | 2 Aug 2001 |
| European Community | 25 Jun 1998 | |
| Finland | 25 Jun 1998 | 1 Sep 2004 A |
| France | 25 Jun 1998 | 8 Jul 2002 AA |
| Georgia | 25 Jun 1998 | 11 Apr 2000 |
| Germany | 21 Dec 1998 | |
| Greece | 25 Jun 1998 | |
| Hungary | 18 Dec 1998 | 3 Jul 2001 |
| Iceland | 25 Jun 1998 | |
| Ireland | 25 Jun 1998 | |
| Italy | 25 Jun 1998 | 13 Jun 2001 |
| Kazakhstan | 25 Jun 1998 | 11 Jan 2001 |
| Kyrgyzstan | 1 May 2001 a | |
| Latvia | 25 Jun 1998 | 14 Jun 2002 |
| Liechtenstein | 25 Jun 1998 | |
| Lithuania | 25 Jun 1998 | 28 Jan 2002 |
| Luxembourg | 25 Jun 1998 | |
| Malta | 18 Dec 1998 | 23 Apr 2002 |
| Monaco | 25 Jun 1998 | |
| Netherlands | 25 Jun 1998 | |
| Norway | 25 Jun 1998 | 2 May 2003 |
| Poland | 25 Jun 1998 | 15 Feb 2002 |
| Portugal | 25 Jun 1998 | 9 Jun 2003 |
| Republic of Moldova | 25 Jun 1998 | 9 Aug 1999 |
| Romania | 25 Jun 1998 | 11 Jul 2000 |
| Slovenia | 25 Jun 1998 | 29 Jul 2004 |
| Spain | 25 Jun 1998 | |
| Sweden | 25 Jun 1998 | |
| Switzerland | 25 Jun 1998 | |
| Tajikistan | 17 Jul 2001 a | |
| The Former Yugoslav Republic of Macedonia | 22 Jul 1999 a | |
| Turkmenistan | 25 Jun 1999 a | |
| Ukraine | 25 Jun 1998 | 18 Nov 1999 |
| United Kingdom of Great Britain and Northern Ireland | 25 Jun 1998 |