| Sold | Grade | Monthly Average |
| May 2020 | 5.5 | $20.90 |
| Apr 2017 | 5.5 | $57.00 |
| Mar 2015 | 5.0 | $22.00 |
| Jan 2021 | 4.5 | $18.50 |
| Nov 2018 | 4.0 | $12.00 |
| Jul 2017 | 4.0 | $12.00 |
| Sep 2022 | 3.5 | $10.50 |
| Sep 2019 | 3.0 | $9.20 |
| Nov 2014 | 3.0 | $10.75 |
| Mar 2013 | 3.0 | $9.20 |
| May 2012 | 2.5 | $7.90 |
| Aug 2020 | 2.0 | $7.80 |
| Oct 2014 | 2.0 | $7.70 |
| Oct 2012 | 2.0 | $6.60 |
| May 2019 | 1.8 | $15.00 |
| Aug 2017 | 1.8 | $6.20 |