| Month | Change |
|---|---|
| 4/11 | -0.31 |
| 5/11 | -0.46 |
| 6/11 | -0.64 |
| 7/11 | -0.74 |
| 8/11 | -0.36 |
| 9/11 | -0.84 |
| Month | Change | 4/12 | -0.61 |
| 5/12 | -0.84 |
| 6/12 | -0.81 |
| 7/12 | -0.86 |
| 8/12 | -0.79 |
| 9/12 | -0.59 |
| 10/12 | -1.03 |
| Month | Change | 4/13 | -0.34 |
| 5/13 | -0.78 |
| 6/13 | -0.54 |
| 7/13 | -0.63 |
| 8/13 | -0.64 |
| 9/13 | -0.83 |
| 10/13 | -0.52 |