| 1998 | ||
| 0 | EU (15 countries) | 7.9 |
| 1 | Belgium | 8.0 |
| 2 | Denmark | 4.0 |
| 3 | Germany | 4.4 |
| 4 | Greece | 4.9 |
| 5 | Spain | 5.4 |
| 6 | France | 8.2 |
| 7 | Ireland | 9.3 |
| 8 | Italy | 6.8 |
| 9 | Luxembourg | 7.7 |
| 10 | Netherlands | 5.8 |
| 11 | Austria | 5.0 |
| 12 | Portugal | 10.0 |
| 13 | Finland | 9.1 |
| 14 | Sweden | 3.4 |
| 15 | United Kingdom | 4.1 |