| Day | Rate | Set date |
|---|---|---|
| 1 May | 18.2900 | .. |
| 2 May | 17.9700 | .. |
| 6 May | 18.0700 | .. |
| 7 May | 18.1600 | .. |
| 8 May | 18.6900 | .. |
| 9 May | 18.9300 | .. |
| 12 May | 19.7200 | .. |
| 13 May | 19.6200 | .. |
| 14 May | 19.5100 | .. |
| 15 May | 19.4400 | .. |
| 16 May | 20.3500 | .. |
| 19 May | 20.1600 | .. |
| 20 May | 20.0000 | .. |
| 21 May | 20.1300 | .. |
| 22 May | 20.1800 | .. |
| 23 May | 20.0000 | .. |
| 27 May | 19.2200 | .. |
| 28 May | 19.2400 | .. |
| 29 May | 19.4800 | .. |
| 30 May | 19.4000 | .. |