| Day | Rate | Set date |
|---|---|---|
| 1 May | 18.8300 | .. |
| 4 May | 18.9200 | .. |
| 5 May | 19.0500 | .. |
| 6 May | 19.2300 | .. |
| 7 May | 19.1300 | .. |
| 8 May | 19.2600 | .. |
| 11 May | 19.4100 | .. |
| 12 May | 19.2700 | .. |
| 13 May | 19.4100 | .. |
| 14 May | 19.5600 | .. |
| 15 May | 19.8000 | .. |
| 18 May | 19.8900 | .. |
| 19 May | 19.8700 | .. |
| 20 May | 19.8700 | .. |
| 21 May | 19.2400 | .. |
| 22 May | 19.3500 | .. |
| 26 May | 19.4200 | .. |
| 27 May | 19.3700 | .. |
| 28 May | 19.2600 | .. |
| 29 May | 19.3800 | .. |