| Day | Rate | Set date |
|---|---|---|
| 3 May | 18.8500 | .. |
| 4 May | 18.9200 | .. |
| 5 May | 18.9800 | .. |
| 6 May | 18.3200 | .. |
| 7 May | 18.2200 | .. |
| 10 May | 18.5000 | .. |
| 11 May | 18.0600 | .. |
| 12 May | 17.5700 | .. |
| 13 May | 18.0300 | .. |
| 14 May | 18.0400 | .. |
| 17 May | 17.9400 | .. |
| 18 May | 17.1100 | .. |
| 19 May | 16.8800 | .. |
| 20 May | 17.0300 | .. |
| 21 May | 17.4100 | .. |
| 24 May | 17.0600 | .. |
| 25 May | 17.1400 | .. |
| 26 May | 17.3500 | .. |
| 27 May | 17.1700 | .. |
| 28 May | 16.8400 | .. |