| Date | Open | Close | Volume |
| 2010-03-03 | 17.81 | 18.21 | 39600 |
| 2010-03-02 | 18.41 | 18.45 | 34000 |
| 2010-03-01 | 17.96 | 18.44 | 43600 |
| 2010-02-26 | 18.39 | 17.88 | 35400 |
| 2010-02-25 | 18.22 | 18.35 | 17400 |
| 2010-02-24 | 18.50 | 18.45 | 21500 |
| 2010-02-23 | 18.40 | 18.50 | 17100 |
| 2010-02-22 | 18.47 | 18.47 | 18500 |
| 2010-02-19 | 18.53 | 18.36 | 37200 |
| 2010-02-18 | 18.04 | 18.52 | 14500 |
| 2010-02-17 | 17.96 | 18.11 | 69900 |
| 2010-02-16 | 17.70 | 17.85 | 40900 |
| 2010-02-12 | 17.75 | 17.68 | 53200 |
| 2010-02-11 | 17.07 | 17.94 | 44400 |
| 2010-02-10 | 17.16 | 17.16 | 29300 |
| 2010-02-09 | 16.74 | 17.14 | 47600 |
| 2010-02-08 | 16.94 | 16.55 | 44500 |
| 2010-02-05 | 16.56 | 17.03 | 44800 |
| 2010-02-04 | 16.62 | 16.48 | 52100 |
| 2010-02-03 | 16.88 | 16.69 | 58500 |
| 2010-02-02 | 16.75 | 16.70 | 311100 |
| 2010-02-01 | 16.66 | 16.79 | 78300 |
| 2010-01-29 | 17.47 | 16.55 | 606100 |
| 2010-01-28 | 18.72 | 18.25 | 31000 |
| 2010-01-27 | 18.25 | 18.63 | 28800 |
| 2010-01-26 | 18.25 | 18.25 | 19300 |
| 2010-01-25 | 18.30 | 18.28 | 20100 |
| 2010-01-22 | 18.50 | 18.16 | 23600 |
| 2010-01-21 | 18.86 | 18.50 | 82300 |
| 2010-01-20 | 18.76 | 18.79 | 129900 |
| 2010-01-19 | 18.50 | 18.85 | 92100 |
| 2010-01-15 | 18.76 | 18.50 | 51600 |
Other Companies: 01-19-2008 | Nuveen Select Tax-Free Income Portfolio | 03-27-2008-1
Boulder Growth & Income Fund Inc. | 11-18-2009-1 | Somanetics Corp.