| Date | Value |
|---|---|
| 2011-08-17 | 27.63% |
| 2011-08-16 | 27.40% |
| 2011-08-11 | 27.14% |
| 2011-08-01 | 26.09% |
| 2011-07-04 | 28.57% |
| 2011-06-25 | 26.19% |
| 2011-06-21 | 23.68% |
| 2011-06-13 | 24.32% |
| 2011-05-31 | 27.27% |
| 2011-05-24 | 26.92% |
| 2011-05-06 | 30.00% |
| 2011-03-30 | 25.00% |
| 2011-03-07 | 25.00% |
| 2011-03-04 | 20.00% |
| 2011-01-19 | 0.00% |