| Date | Open | Close | Volume |
| 2010-03-03 | 4.29 | 4.24 | 77500 |
| 2010-03-02 | 4.33 | 4.27 | 37600 |
| 2010-03-01 | 4.33 | 4.33 | 45000 |
| 2010-02-26 | 4.38 | 4.29 | 43700 |
| 2010-02-25 | 4.50 | 4.38 | 27100 |
| 2010-02-24 | 4.47 | 4.43 | 19200 |
| 2010-02-23 | 4.64 | 4.47 | 30200 |
| 2010-02-22 | 4.55 | 4.59 | 23600 |
| 2010-02-19 | 4.55 | 4.53 | 23800 |
| 2010-02-18 | 4.57 | 4.53 | 22200 |
| 2010-02-17 | 4.55 | 4.58 | 44500 |
| 2010-02-16 | 4.55 | 4.52 | 18800 |
| 2010-02-12 | 4.50 | 4.49 | 34500 |
| 2010-02-11 | 4.54 | 4.55 | 31200 |
| 2010-02-10 | 4.50 | 4.54 | 32900 |
| 2010-02-09 | 4.50 | 4.53 | 24300 |
| 2010-02-08 | 4.75 | 4.43 | 41200 |
| 2010-02-05 | 4.95 | 4.74 | 83200 |
| 2010-02-04 | 5.06 | 5.00 | 28300 |
| 2010-02-03 | 5.05 | 5.06 | 19000 |
| 2010-02-02 | 5.20 | 5.10 | 32200 |
| 2010-02-01 | 5.12 | 5.20 | 36100 |
| 2010-01-29 | 5.25 | 5.12 | 24500 |
| 2010-01-28 | 5.46 | 5.22 | 47800 |
| 2010-01-27 | 5.32 | 5.44 | 30700 |
| 2010-01-26 | 5.45 | 5.33 | 13800 |
| 2010-01-25 | 5.54 | 5.45 | 23600 |
| 2010-01-22 | 5.48 | 5.50 | 26900 |
| 2010-01-21 | 5.77 | 5.50 | 34500 |
| 2010-01-20 | 5.91 | 5.77 | 22600 |
| 2010-01-19 | 5.85 | 5.95 | 14600 |
| 2010-01-15 | 6.08 | 5.85 | 38500 |
Other Companies: 02-11-2008-1 | MDU Resources Group Inc. | 10-30-2007-1
China Unicom Hong Kong Limited. | 07-04-2008 | Twin Disc Inc.