| Year | Qtr | # Shares | Change |
|---|---|---|---|
| 2016 | Q1 | 19,731 | -4,414 |
| 2015 | Q4 | 24,145 | +4,767 |
| 2015 | Q3 | 19,378 | -1,475 |
| 2015 | Q2 | 20,853 | +1,785 |
| 2015 | Q1 | 19,068 | +3,096 |
| 2014 | Q4 | 15,972 | -1,812 |
| 2014 | Q3 | 17,784 | -2,567 |
| 2014 | Q2 | 20,351 | +249 |
| 2014 | Q1 | 20,102 | +411 |
| 2013 | Q4 | 19,691 | -392 |
| 2013 | Q3 | 20,083 | -2,804 |
| 2013 | Q2 | 22,887 | -19,711 |
| 2013 | Q1 | 42,598 | +3,456 |
| 2012 | Q4 | 39,142 | -1,017 |
| 2012 | Q3 | 40,159 | -4,451 |
| 2012 | Q2 | 44,610 | -10,139 |
| 2012 | Q1 | 54,749 | +147 |
| 2011 | Q4 | 54,602 | +9,830 |
| 2011 | Q3 | 44,772 | -7,548 |
| 2011 | Q2 | 52,320 | -1,422 |
| 2011 | Q1 | 53,742 |