| Year | Qtr | # Shares | Change |
|---|---|---|---|
| 2013 | Q1 | 14,970,463 | -561,061 |
| 2012 | Q4 | 15,531,524 | -59,100 |
| 2012 | Q3 | 15,590,624 | +380,900 |
| 2012 | Q2 | 15,209,724 | -1,897,500 |
| 2012 | Q1 | 17,107,224 | -462,076 |
| 2011 | Q4 | 17,569,300 | -1,278,300 |
| 2011 | Q3 | 18,847,600 | +894,700 |
| 2011 | Q2 | 17,952,900 | +16,000 |
| 2011 | Q1 | 17,936,900 | +181,200 |
| 2010 | Q4 | 17,755,700 |