| Country | Wave | Coder |
| Europe | 1979, 1984, 1989, 1994, 1999, 2004 | Ivo Georgiev |
| Austria | 1996, 1999, 2004 | Alice Ludvig |
| Belgium-Flanders | 1979, 1984, 1989, 1994, 1999 | Pierre Baudewins |
| 1979, 1984, 1989, 1994, 1999 | Monique Boijnk | |
| 1979, 1984, 1989, 1994, 1999, 2004 | Joost de Vries | |
| Belgium-Wallonia | 1979, 1984, 1989, 1994, 1999 | Pierre Baudewins |
| 1999 | Anna Marek | |
| 1984, 1989, 1994 | Sophie Jacquot | |
| 2004 | Zane Badere | |
| Cyprus | 2004 | Vasileia Andreadaki |
| Czech Republic | 2004 | Lukas Linek |
| Denmark | 1979, 1984, 1989, 1994, 1999, 2004 | Pernille Stehen |
| Estonia | 2004 | Kadri Lúhiste |
| Finland | 1996, 1999, 2004 | Kirsi Airo |
| France | 1979, 1984, 1989, 1994, 1999, 2004 | Anna Marek |
| 1979, 1984, 1989, 1994, 1999, 2004 | Sophie Jacquot | |
| 1989, 1999 | Silviu Matei | |
| Germany | 1979, 1984, 1989, 1994, 1999, 2004 | Ivo Georgiev |
| Great Britain | 1999 | Ivo Georgiev |
| 2004 | Eoin O'Malley | |
| 1979, 1984, 1989, 1994, 1999, 2004 | Rob Johns | |
| Greece | 1984, 1989, 1994, 1999, 2004 | Vasileia Andreadaki |
| Hungary | 2004 | Ivo Georgiev |
| Ireland | 1984, 1989 | Ivo Georgiev |
| 1979, 1994, 1999, 2004 | Eoin O’Malley | |
| 1979, 1989, 1994, 1999 | Francesco Cavatorta | |
| Italy | 1994, 1999, 2004 | Laura Castiglioni |
| 1979, 1984, 1989, 1994, 1999, 2004 | Nicolo Conti | |
| Hungary | 2004 | Viktoria Gati |
| Latvia | 2004 | Zane Badere |
| Lithuania | 2004 | Ligita Sarkute |
| Luxembourg | 1979, 1984, 1989, 1994, 1999 | Yasmin Thill |
| 2004 | Zane Badere | |
| Malta | 2004 | Ivo Georgiev |
| 2004 | Rob Johns | |
| Netherlands | 1994, 1999, 2004 | Ivo Georgiev |
| 1979, 1984, 1989, 1994, 1999 | Willem Bonekamp | |
| 1979, 1984, 1989, 1994, 1999 | Monique Boijnk | |
| 1989, 1994, 1999, 2004 | Joost de Vries | |
| Northern Ireland | 1979, 1984, 1989, 1994, 1999, 2004 | Eoin O’Malley |
| Poland | 2004 | Anna Gwiazda |
| Portugal | 1987, 1989, 1994, 1999 | Filipe Nunez |
| 2004 | Miguel Cabrita | |
| 1989, 2004 | Tito Matos e Campos | |
| Slovakia | 2004 | Olga Gyarfasova |
| Slovenia | 2004 | Simona Kustec Lipicer |
| Spain | 2004 | Ivo Georgiev |
| 1989, 1994, 1999 | Filipe Nunez | |
| 1987, 1989, 1994, 1999, 2004 | Raul Tormos | |
| 1989, 1994 | Miguel Cabrita | |
| Sweden | 1995, 1999, 2004 | Johan Martinsson |