| Day | Rate | Set date |
|---|---|---|
| 1 May | 20.8100 | .. |
| 2 May | 20.8600 | .. |
| 3 May | 21.1800 | .. |
| 6 May | 21.0400 | .. |
| 7 May | 21.1100 | .. |
| 8 May | 21.0000 | .. |
| 9 May | 20.6800 | .. |
| 10 May | 21.0100 | .. |
| 13 May | 21.3600 | .. |
| 14 May | 21.4200 | .. |
| 15 May | 21.4800 | .. |
| 16 May | 20.7800 | .. |
| 17 May | 20.6400 | .. |
| 20 May | 22.4800 | .. |
| 21 May | 22.6500 | .. |
| 22 May | 21.4000 | .. |
| 23 May | 21.2300 | .. |
| 24 May | 21.3200 | .. |
| 28 May | 21.1100 | .. |
| 29 May | 20.7600 | .. |
| 30 May | 19.9400 | .. |
| 31 May | 19.7600 | .. |