| Day | Rate | Set date |
|---|---|---|
| 3 August | 22.1600 | .. |
| 4 August | 21.9700 | .. |
| 5 August | 21.2900 | .. |
| 6 August | 21.1400 | .. |
| 7 August | 20.9900 | .. |
| 10 August | 20.7300 | .. |
| 11 August | 20.9900 | .. |
| 12 August | 20.9900 | .. |
| 13 August | 20.7700 | .. |
| 14 August | 20.5700 | .. |
| 17 August | 19.8300 | .. |
| 18 August | 19.9000 | .. |
| 19 August | 19.6300 | .. |
| 20 August | 19.4200 | .. |
| 21 August | 18.9000 | .. |
| 24 August | 18.6000 | .. |
| 25 August | 18.6400 | .. |
| 26 August | 19.4600 | .. |
| 27 August | 19.6400 | .. |
| 28 August | 19.3900 | .. |
| 31 August | 19.7300 | .. |