| year | region | |
|---|---|---|
| 2007 | 54 | |
| 2007 | 48.3 | |
| 2007 | 43.6 | |
| 2007 | 41 | |
| 2007 | 41 | |
| 2007 | 40.3 | |
| 2007 | 36.4 | |
| 2007 | 34.6 | |
| 2007 | 34.2 | |
| 2007 | 33.7 | |
| 2007 | 33.3 | |
| 2007 | 32.2 | |
| 2007 | 32.2 | |
| 2007 | 32.1 | |
| 2007 | 31.8 | |
| 2007 | 31.3 | |
| 2007 | 31.3 | |
| 2007 | 30.8 | |
| 2007 | 29.8 | |
| 2007 | 29 | |
| 2007 | 26.8 | |
| 2007 | 26.5 | |
| 2007 | 24.3 | |
| 2007 | 22.7 | |
| 2007 | 22.2 | |
| 2007 | 18.7 | |
| 2007 | 17.7 | |
| 2007 | 17.6 | |
| 2007 | 15.9 | |
| 2007 | 14.1 | |
| 2007 | 13.7 | |
| 2007 | 13.7 | |
| 2007 | 13.6 | |
| 2007 | 13.2 | |
| 2007 | 10.8 | |
| 2007 | 9.6 |