| Year | Qtr | # Shares | Change |
|---|---|---|---|
| 2015 | Q2 | 4,190 | +171 |
| 2015 | Q1 | 4,019 | -48 |
| 2014 | Q4 | 4,067 | -1,001 |
| 2014 | Q3 | 5,068 | +26 |
| 2014 | Q2 | 5,042 | +116 |
| 2014 | Q1 | 4,926 | -227 |
| 2013 | Q4 | 5,153 | -93 |
| 2013 | Q3 | 5,246 | -1,616 |
| 2013 | Q2 | 6,862 | -171 |
| 2013 | Q1 | 7,033 | -969 |
| 2012 | Q4 | 8,002 | -2,057 |
| 2012 | Q3 | 10,059 | -822 |
| 2012 | Q2 | 10,881 | -1,829 |
| 2012 | Q1 | 12,710 | -274 |
| 2011 | Q4 | 12,984 | -3,128 |
| 2011 | Q3 | 16,112 | -1,183 |
| 2011 | Q2 | 17,295 | +656 |
| 2011 | Q1 | 16,639 |