| 1997 | ||
| 0 | European Union (15 countries) | 3817 |
| 1 | Belgium | 11603 |
| 2 | Denmark | 5077 |
| 3 | Germany | 13266 |
| 4 | Greece | 7044 |
| 5 | Spain | 15969 |
| 6 | France | 5130 |
| 7 | Ireland | 13449 |
| 8 | Italy | 1774 |
| 9 | Luxembourg | 6441 |
| 10 | Netherlands | 2075 |
| 11 | Austria | 7310 |
| 12 | Portugal | 4724 |
| 13 | Finland | 12997 |
| 14 | Sweden | 2853 |
| 15 | United Kingdom | 10585 |