| Month | Change |
|---|---|
| 4/10 | -26.20 |
| 5/10 | -28.95 |
| 6/10 | -27.52 |
| 7/10 | -26.89 |
| 8/10 | -26.09 |
| 9/10 | -25.27 |
| Month | Change | 4/11 | -27.58 |
| 5/11 | -25.54 |
| 6/11 | -30.25 |
| Month | Change | 4/12 | -30.17 |
| 5/12 | -30.90 |
| 6/12 | -29.25 |
| 7/12 | -28.05 |
| 8/12 | -27.97 |
| 9/12 | -27.66 |
| 10/12 | -27.36 |
| Month | Change | 4/13 | -29.87 |
| 5/13 | -28.01 |
| 6/13 | -27.12 |
| 9/13 | -29.04 |
| 10/13 | -28.83 |
| Month | Change | 4/14 | -24.11 |
| 5/14 | -26.92 |
| 6/14 | -22.73 |
| 7/14 | -25.83 |
| 8/14 | -28.68 |
| 9/14 | -27.94 |
| Month | Change | 4/15 | -30.84 |
| 5/15 | -29.82 |
| 6/15 | -30.23 |
| 7/15 | -29.70 |