1992
0.35
Indice par pays
| Année | Indice |
|---|---|
| United Kingdom | 0.42 |
| France | 0.41 |
| Australia | 0.4 |
| Netherlands | 0.39 |
| Denmark | 0.39 |
| New Zealand | 0.39 |
| Sweden | 0.39 |
| Norway | 0.37 |
| Germany | 0.36 |
| Italy | 0.36 |
| Finland | 0.36 |
| Austria | 0.34 |
| Korea | 0.3 |
| Costa Rica | 0.29 |
| China | 0.23 |
| Switzerland | 0.22 |