| Sold | Grade | Monthly Average |
| Jan 2026 | 5.5 | $5.49 |
| Sep 2012 | 9.4 | $3.15 |
| Jul 2012 | 9.4 | $3.15 |
| Jun 2012 | 9.4 | $2.81 |
| May 2012 | 9.4 | $2.70 |
| Apr 2012 | 9.4 | $2.60 |
| Dec 2010 | 9.4 | $3.00 |
| Dec 2025 | 8.0 | $9.60 |
| Sep 2020 | 8.0 | $8.00 |
| Jun 2014 | 7.0 | $7.00 |
| Feb 2015 | 6.0 | $6.00 |
| Feb 2012 | 6.0 | $1.40 |
| Jun 2019 | 5.5 | $6.00 |
| Jul 2018 | 5.5 | $5.49 |
| Mar 2017 | 4.5 | $4.49 |
| Aug 2025 | 4.0 | $4.00 |
| Jan 2018 | 4.0 | $4.00 |
| Mar 2022 | 3.5 | $3.49 |
| Jan 2025 | 2.0 | $2.50 |