| Day | Rate | Set date |
|---|---|---|
| 4 May | 19.0500 | .. |
| 5 May | 19.1600 | .. |
| 6 May | 19.1600 | .. |
| 7 May | 19.1900 | .. |
| 10 May | 19.1000 | .. |
| 11 May | 19.0700 | .. |
| 12 May | 18.9700 | .. |
| 13 May | 18.7000 | .. |
| 14 May | 18.6000 | .. |
| 17 May | 18.4100 | .. |
| 18 May | 18.2800 | .. |
| 19 May | 18.2000 | .. |
| 20 May | 18.4500 | .. |
| 21 May | 18.4300 | .. |
| 24 May | 18.3300 | .. |
| 25 May | 18.4900 | .. |
| 26 May | 18.4800 | .. |
| 27 May | 18.5900 | .. |
| 28 May | 18.6000 | .. |