| 1997 | ||
| 0 | EU (15 countries) | 4.9 |
| 1 | Belgium | 4.7 |
| 2 | Denmark | 1.6 |
| 3 | Germany | 0.6 |
| 4 | Greece | 1.2 |
| 5 | Spain | 1.1 |
| 6 | France | 2.5 |
| 7 | Ireland | 2.0 |
| 8 | Italy | 21.4 |
| 9 | Luxembourg | 21.3 |
| 10 | Netherlands | 10.0 |
| 11 | Austria | 10.2 |
| 12 | Portugal | 2.5 |
| 13 | Finland | 2.6 |
| 14 | Sweden | 2.7 |
| 15 | United Kingdom | 3.5 |