| Year | Qtr | # Shares | Change |
|---|---|---|---|
| 2013 | Q3 | 108,000 | -12,000 |
| 2013 | Q2 | 120,000 | -7,780 |
| 2013 | Q1 | 127,780 | -31,320 |
| 2012 | Q4 | 159,100 | -500 |
| 2012 | Q3 | 159,600 | -97,700 |
| 2012 | Q2 | 257,300 | +29,500 |
| 2012 | Q1 | 227,800 | -247,400 |
| 2011 | Q4 | 475,200 | |
| 2011 | Q3 | 475,200 | -123,100 |
| 2011 | Q2 | 598,300 | +412,200 |
| 2011 | Q1 | 186,100 |