| Day | Rate | Set date |
|---|---|---|
| 5 July | 20.7900 | .. |
| 6 July | 20.3000 | .. |
| 7 July | 20.7500 | .. |
| 10 July | 20.3600 | .. |
| 11 July | 20.5300 | .. |
| 12 July | 20.1500 | .. |
| 13 July | 20.3500 | .. |
| 14 July | 20.3200 | .. |
| 17 July | 20.4500 | .. |
| 18 July | 20.3400 | .. |
| 19 July | 19.8500 | .. |
| 20 July | 19.9000 | .. |
| 21 July | 19.5100 | .. |
| 24 July | 18.7400 | .. |
| 25 July | 18.5400 | .. |
| 26 July | 18.3000 | .. |
| 27 July | 18.1200 | .. |
| 28 July | 17.9300 | .. |
| 31 July | 18.3100 | .. |