| 1997 | ||
| 0 | EU (15 countries) | 5.1 |
| 1 | Belgium | 4.5 |
| 2 | Denmark | 2.9 |
| 3 | Germany | 4.6 |
| 4 | Greece | 6.5 |
| 5 | Spain | 5.9 |
| 6 | France | 4.5 |
| 7 | Ireland | 5.1 |
| 8 | Italy | 5.9 |
| 9 | Luxembourg | 4.3 |
| 10 | Netherlands | 4.2 |
| 11 | Austria | 4.0 |
| 12 | Portugal | 7.4 |
| 13 | Finland | .. |
| 14 | Sweden | .. |
| 15 | United Kingdom | 5.2 |