+-----------------+--------+--------+--------+
| USA             |     46 |     37 |     38 |
| Grande-bretagne |     27 |     23 |     17 |
| Chine           |     26 |     18 |     26 |
| Russie          |     19 |     18 |     19 |
| Allemagne       |     17 |     10 |     15 |
| Japon           |     12 |      8 |     21 |
| France          |     10 |     18 |     14 |
| Corée-du-sud    |      9 |      3 |      9 |
| Italie          |      8 |     12 |      8 |
| Australie       |      8 |     11 |     10 |
+-----------------+--------+--------+--------+