| 1998 | ||
| 0 | EU (15 countries) | 17.9 |
| 1 | Belgium | 15.9 |
| 2 | Denmark | 12.6 |
| 3 | Germany | 12.1 |
| 4 | Greece | 5.0 |
| 5 | Spain | 8.8 |
| 6 | France | 11.7 |
| 7 | Ireland | 13.3 |
| 8 | Italy | 28.5 |
| 9 | Luxembourg | 25.4 |
| 10 | Netherlands | 30.1 |
| 11 | Austria | 19.2 |
| 12 | Portugal | 18.0 |
| 13 | Finland | 15.0 |
| 14 | Sweden | 35.9 |
| 15 | United Kingdom | 19.1 |