| Day | Rate | Set date |
|---|---|---|
| 1 May | 13.8100 | .. |
| 2 May | 14.7300 | .. |
| 5 May | 14.3300 | .. |
| 6 May | 14.3200 | .. |
| 7 May | 15.2100 | .. |
| 8 May | 15.7400 | .. |
| 9 May | 15.8600 | .. |
| 12 May | 15.7700 | .. |
| 13 May | 15.8900 | .. |
| 14 May | 15.5100 | .. |
| 15 May | 15.6800 | .. |
| 16 May | 16.1600 | .. |
| 19 May | 17.1600 | .. |
| 20 May | 16.0400 | .. |
| 21 May | 14.8200 | .. |
| 22 May | 15.1600 | .. |
| 23 May | 15.5900 | .. |
| 27 May | 15.1000 | .. |
| 28 May | 14.8300 | .. |
| 29 May | 14.5400 | .. |
| 30 May | 14.3000 | .. |