| Date | Class A | Class F |
|---|
| Jul 21, 2011 | 12.22 | 12.85 |
| Jul 14, 2011 | 12.16 | 12.79 |
| Jul 7, 2011 | 12.13 | 12.75 |
| Jun 30, 2011 | 12.04 | 12.66 |
| Jun 23, 2011 | 12.14 | 12.75 |
| Jun 16, 2011 | 12.18 | 12.80 |
| Jun 9, 2011 | 12.21 | 12.83 |
| Jun 2, 2011 | 12.27 | 12.88 |
| May 26, 2011 | 12.32 | 12.94 |
| May 19, 2011 | 12.35 | 12.97 |
| May 12, 2011 | 12.34 | 12.96 |
| May 5, 2011 | 12.34 | 12.96 |
| Apr 28, 2011 | 12.36 | 12.97 |
| Apr 21, 2011 | 12.31 | 12.91 |
| Apr 14, 2011 | 12.24 | 12.84 |
| Apr 7, 2011 | 12.20 | 12.80 |
| Mar 31, 2011 | 12.18 | 12.77 |
| Mar 24, 2011 | 12.23 | 12.82 |
| Mar 17, 2011 | 12.21 | 12.80 |
| Mar 10, 2011 | 12.21 | 12.80 |
| Date | Class A | Class F |
|---|
| Mar 3, 2011 | 12.17 | 12.76 |
| Feb 24, 2011 | 12.24 | 12.83 |
| Feb 17, 2011 | 12.18 | 12.77 |
| Feb 10, 2011 | 12.10 | 12.68 |
| Feb 3, 2011 | 12.09 | 12.67 |
| Jan 27, 2011 | 12.18 | 12.76 |
| Jan 20, 2011 | 12.10 | 12.67 |
| Jan 13, 2011 | 12.12 | 12.69 |
| Jan 6, 2011 | 12.04 | 12.61 |