| Day | Rate | Set date |
|---|---|---|
| 1 August | 18.9500 | .. |
| 4 August | 19.4600 | .. |
| 5 August | 19.5200 | .. |
| 6 August | 19.2000 | .. |
| 7 August | 18.9000 | .. |
| 8 August | 18.4800 | .. |
| 11 August | 18.5800 | .. |
| 12 August | 18.8500 | .. |
| 13 August | 18.9900 | .. |
| 14 August | 19.1900 | .. |
| 15 August | 18.9900 | .. |
| 18 August | 18.9300 | .. |
| 19 August | 19.0700 | .. |
| 20 August | 18.9600 | .. |
| 21 August | 18.5100 | .. |
| 22 August | 18.5400 | .. |
| 26 August | 18.2000 | .. |
| 27 August | 18.5600 | .. |
| 28 August | 18.4000 | .. |
| 29 August | 18.5100 | .. |