| Date | Open | Close | Volume |
| 2010-03-02 | 11.74 | 12.61 | 3135500 |
| 2010-03-01 | 11.46 | 11.53 | 1258600 |
| 2010-02-26 | 11.48 | 11.35 | 1350600 |
| 2010-02-25 | 10.34 | 11.44 | 1846600 |
| 2010-02-24 | 10.88 | 10.56 | 761200 |
| 2010-02-23 | 11.46 | 10.67 | 1608200 |
| 2010-02-22 | 11.88 | 11.45 | 647800 |
| 2010-02-19 | 11.47 | 11.70 | 939900 |
| 2010-02-18 | 11.32 | 11.75 | 1070500 |
| 2010-02-17 | 11.85 | 11.53 | 1140900 |
| 2010-02-16 | 11.49 | 11.77 | 1816300 |
| 2010-02-12 | 10.65 | 11.03 | 1229300 |
| 2010-02-11 | 10.35 | 11.07 | 1386900 |
| 2010-02-10 | 10.53 | 10.28 | 1029800 |
| 2010-02-09 | 10.24 | 10.50 | 2109800 |
| 2010-02-08 | 10.30 | 9.89 | 1361300 |
| 2010-02-05 | 9.81 | 10.28 | 2179000 |
| 2010-02-04 | 10.69 | 9.91 | 2123100 |
| 2010-02-03 | 11.42 | 11.04 | 910700 |
| 2010-02-02 | 11.49 | 11.42 | 1927600 |
| 2010-02-01 | 10.13 | 11.27 | 2775400 |
| 2010-01-29 | 11.01 | 10.05 | 1924600 |
| 2010-01-28 | 10.88 | 10.76 | 1713500 |
| 2010-01-27 | 11.30 | 10.66 | 2626900 |
| 2010-01-26 | 11.78 | 11.40 | 1727900 |
| 2010-01-25 | 11.77 | 12.10 | 1728500 |
| 2010-01-22 | 12.15 | 11.61 | 2600000 |
| 2010-01-21 | 13.80 | 12.51 | 2534700 |
| 2010-01-20 | 13.63 | 13.80 | 2918500 |
| 2010-01-19 | 12.64 | 14.10 | 3754000 |
| 2010-01-15 | 12.65 | 12.46 | 1574000 |
| 2010-01-14 | 12.76 | 12.57 | 1242000 |
Other Companies: 01-04-2007 | Arbitron Inc. | 07-12-2007-1
Unum Group | 10-01-2007-1 | WisdomTree International Cons Staples