| Month | Change |
|---|---|
| 4/10 | -3.02 |
| 5/10 | -2.76 |
| 6/10 | -2.68 |
| 7/10 | -2.06 |
| 8/10 | -2.87 |
| 9/10 | -2.31 |
| Month | Change | 4/11 | -2.02 |
| 5/11 | -2.79 |
| 6/11 | -2.02 |
| Month | Change | 4/12 | -1.48 |
| 5/12 | -2.45 |
| 6/12 | -2.09 |
| 7/12 | -2.20 |
| 8/12 | -2.75 |
| 9/12 | -2.90 |
| 10/12 | -2.75 |
| Month | Change | 4/13 | -1.94 |
| 5/13 | -1.69 |
| 6/13 | -1.73 |
| 9/13 | -0.94 |
| 10/13 | -2.09 |
| Month | Change | 4/14 | -2.53 |
| 5/14 | -1.56 |
| 6/14 | -3.49 |
| 7/14 | -1.96 |
| 8/14 | -1.86 |
| 9/14 | -3.01 |
| Month | Change | 4/15 | -7.14 |
| 5/15 | -6.18 |
| 6/15 | -6.68 |
| 7/15 | -6.19 |