| Year | Qtr | # Shares | Change |
|---|---|---|---|
| 2015 | Q2 | 528,260 | -622 |
| 2015 | Q1 | 528,882 | +14,384 |
| 2014 | Q4 | 514,498 | +88,145 |
| 2014 | Q3 | 426,353 | -23,813 |
| 2014 | Q2 | 450,166 | +85,867 |
| 2014 | Q1 | 364,299 | -12,219 |
| 2013 | Q4 | 376,518 | +120,409 |
| 2013 | Q3 | 256,109 | +15,179 |
| 2013 | Q2 | 240,930 | -143,372 |
| 2013 | Q1 | 384,302 | +60,325 |
| 2012 | Q4 | 323,977 | -397 |
| 2012 | Q3 | 324,374 | -100,325 |
| 2012 | Q2 | 424,699 | -325,922 |
| 2012 | Q1 | 750,621 | +226,851 |
| 2011 | Q4 | 523,770 | -5,347 |
| 2011 | Q3 | 529,117 | -80,939 |
| 2011 | Q2 | 610,056 | +103,628 |
| 2011 | Q1 | 506,428 |