| Year | Qtr | # Shares | Change |
|---|---|---|---|
| 2013 | Q3 | 425,000 | -25,000 |
| 2013 | Q2 | 450,000 | -17,900 |
| 2013 | Q1 | 467,900 | +100 |
| 2012 | Q4 | 467,800 | -9,000 |
| 2012 | Q3 | 476,800 | +9,000 |
| 2012 | Q2 | 467,800 | -200 |
| 2012 | Q1 | 468,000 | -4,900 |
| 2011 | Q4 | 472,900 | -167,600 |
| 2011 | Q3 | 640,500 | +78,400 |
| 2011 | Q2 | 562,100 | +2,900 |
| 2011 | Q1 | 559,200 |