| Day | Rate | Set date |
|---|---|---|
| 2 August | 17.9700 | .. |
| 3 August | 17.8500 | .. |
| 4 August | 17.8000 | .. |
| 5 August | 17.5700 | .. |
| 6 August | 17.2700 | .. |
| 9 August | 17.5500 | .. |
| 10 August | 17.5200 | .. |
| 11 August | 17.8800 | .. |
| 12 August | 18.1800 | .. |
| 13 August | 18.1400 | .. |
| 16 August | 17.8600 | .. |
| 17 August | 17.9200 | .. |
| 18 August | 17.6600 | .. |
| 19 August | 17.6500 | .. |
| 20 August | 18.0900 | .. |
| 23 August | 18.5300 | .. |
| 24 August | 18.3500 | .. |
| 25 August | 18.3200 | .. |
| 26 August | 18.3600 | .. |
| 27 August | 18.8000 | .. |
| 30 August | 18.7300 | .. |
| 31 August | 18.2900 | .. |