| Year | Qtr | # Shares | Change |
|---|---|---|---|
| 2015 | Q2 | 24,294 | +5,143 |
| 2015 | Q1 | 19,151 | +1,518 |
| 2014 | Q4 | 17,633 | -3,386 |
| 2014 | Q3 | 21,019 | +582 |
| 2014 | Q2 | 20,437 | +2,601 |
| 2014 | Q1 | 17,836 | -6,849 |
| 2013 | Q4 | 24,685 | -3,630 |
| 2013 | Q3 | 28,315 | +680 |
| 2013 | Q2 | 27,635 | -6,455 |
| 2013 | Q1 | 34,090 | -4,703 |
| 2012 | Q4 | 38,793 | +1,253 |
| 2012 | Q3 | 37,540 | +3,539 |
| 2012 | Q2 | 34,001 | -10,525 |
| 2012 | Q1 | 44,526 | -15,193 |
| 2011 | Q4 | 59,719 | +12,046 |
| 2011 | Q3 | 47,673 | +7,084 |
| 2011 | Q2 | 40,589 |