| Date | Open | Close | Volume |
| 2010-03-02 | 20.98 | 20.75 | 1193500 |
| 2010-03-01 | 20.50 | 20.82 | 751700 |
| 2010-02-26 | 20.45 | 20.45 | 1084000 |
| 2010-02-25 | 20.16 | 20.37 | 1355800 |
| 2010-02-24 | 20.27 | 20.53 | 996800 |
| 2010-02-23 | 20.66 | 20.18 | 793600 |
| 2010-02-22 | 21.02 | 20.71 | 1089600 |
| 2010-02-19 | 20.77 | 20.95 | 935800 |
| 2010-02-18 | 20.52 | 20.75 | 878500 |
| 2010-02-17 | 20.50 | 20.52 | 980900 |
| 2010-02-16 | 20.01 | 20.38 | 1185400 |
| 2010-02-12 | 19.86 | 19.97 | 1384300 |
| 2010-02-11 | 19.80 | 20.15 | 1362700 |
| 2010-02-10 | 19.86 | 19.84 | 793000 |
| 2010-02-09 | 19.82 | 19.90 | 1125800 |
| 2010-02-08 | 19.70 | 19.62 | 1338600 |
| 2010-02-05 | 19.51 | 19.74 | 1650200 |
| 2010-02-04 | 20.36 | 19.58 | 1329100 |
| 2010-02-03 | 20.68 | 20.57 | 935900 |
| 2010-02-02 | 21.06 | 20.83 | 1340400 |
| 2010-02-01 | 20.32 | 20.71 | 1204300 |
| 2010-01-29 | 20.70 | 20.16 | 1878400 |
| 2010-01-28 | 21.06 | 20.57 | 2325200 |
| 2010-01-27 | 21.93 | 20.87 | 4422800 |
| 2010-01-26 | 20.76 | 20.90 | 1175900 |
| 2010-01-25 | 20.86 | 20.82 | 933400 |
| 2010-01-22 | 21.37 | 20.57 | 1511600 |
| 2010-01-21 | 21.91 | 21.46 | 1146300 |
| 2010-01-20 | 22.18 | 21.94 | 1240600 |
| 2010-01-19 | 22.00 | 22.37 | 1088000 |
| 2010-01-15 | 22.61 | 21.98 | 832200 |
| 2010-01-14 | 22.48 | 22.56 | 708400 |
Other Companies: 05-04-2009 | Nuveen Senior Income Fund - Nuveen Floating Rate Income Fund | 07-14-2007-1
Acorda Therapeutics, Inc. | 04-18-2009 | Zweig Total Return Fund Inc.