| Day | Rate | Set date |
|---|---|---|
| 1 May | 20.6600 | .. |
| 2 May | 19.8000 | .. |
| 3 May | 20.1000 | .. |
| 4 May | 20.5800 | .. |
| 5 May | 20.0200 | .. |
| 8 May | 19.4400 | .. |
| 9 May | 19.7600 | .. |
| 10 May | 19.5200 | .. |
| 11 May | 20.0600 | .. |
| 12 May | 20.0900 | .. |
| 15 May | 20.5100 | .. |
| 16 May | 20.7000 | .. |
| 17 May | 20.1300 | .. |
| 18 May | 20.2000 | .. |
| 19 May | 20.6000 | .. |
| 22 May | 20.9300 | .. |
| 23 May | 20.9300 | .. |
| 24 May | 19.6600 | .. |
| 25 May | 19.4800 | .. |
| 26 May | 19.5200 | .. |
| 30 May | 19.9500 | .. |
| 31 May | 19.9000 | .. |