| Sold | Grade | Monthly Average |
| Jun 2011 | 9.4 | $3.30 |
| Apr 2014 | 8.0 | $3.20 |
| Dec 2018 | 7.5 | $7.49 |
| May 2021 | 6.5 | $6.49 |
| Feb 2020 | 6.5 | $6.49 |
| Sep 2022 | 6.0 | $2.40 |
| Jan 2019 | 6.0 | $5.85 |
| Aug 2016 | 6.0 | $5.25 |
| Feb 2015 | 6.0 | $3.90 |
| Mar 2012 | 6.0 | $3.00 |
| Feb 2010 | 6.0 | $3.90 |
| Aug 2023 | 4.0 | $2.50 |
| Jan 2021 | 4.0 | $4.00 |
| Jun 2016 | 4.0 | $2.80 |