| Year | Qtr | # Shares | Change |
|---|---|---|---|
| 2013 | Q3 | 880,000 | |
| 2013 | Q2 | 880,000 | +22,600 |
| 2013 | Q1 | 857,400 | +20,000 |
| 2012 | Q4 | 837,400 | -209,900 |
| 2012 | Q3 | 1,047,300 | +389,200 |
| 2012 | Q2 | 658,100 | +386,600 |
| 2012 | Q1 | 271,500 | +1,000 |
| 2011 | Q4 | 270,500 | -59,000 |
| 2011 | Q3 | 329,500 | +31,000 |
| 2011 | Q2 | 298,500 |