| Year | Qtr | # Shares | Change |
|---|---|---|---|
| 2019 | Q1 | 4,100 | -8,900 |
| 2018 | Q4 | 13,000 | |
| 2018 | Q3 | 13,000 | |
| 2018 | Q2 | 13,000 | -181,100 |
| 2018 | Q1 | 194,100 | -12,100 |
| 2017 | Q4 | 206,200 | -793,500 |
| 2017 | Q3 | 999,700 | -98,000 |
| 2017 | Q2 | 1,097,700 | -283,500 |
| 2017 | Q1 | 1,381,200 | -327,700 |
| 2016 | Q4 | 1,708,900 | +322,800 |
| 2016 | Q3 | 1,386,100 | +242,000 |
| 2016 | Q2 | 1,144,100 |