| Date | Value |
|---|---|
| 2011-08-17 | 826,799 |
| 2011-08-16 | 826,500 |
| 2011-08-11 | 826,412 |
| 2011-08-01 | 826,266 |
| 2011-07-04 | 272,645 |
| 2011-06-25 | 274,538 |
| 2011-06-21 | 274,780 |
| 2011-06-13 | 275,104 |
| 2011-05-31 | 275,655 |
| 2011-05-24 | 274,259 |
| 2011-05-06 | 275,152 |
| 2011-03-30 | 278,374 |
| 2011-03-07 | 276,956 |
| 2011-03-04 | 284,599 |
| 2011-01-19 | 277,438 |