| Sold | Grade | Monthly Average |
| Jul 2026 | 4.0 | $2.65 |
| May 2024 | 6.0 | $3.00 |
| May 2023 | 6.0 | $3.60 |
| Oct 2016 | 6.0 | $2.40 |
| Mar 2016 | 6.0 | $2.43 |
| Apr 2022 | 4.0 | $2.40 |
| Apr 2021 | 4.0 | $2.00 |
| Oct 2018 | 4.0 | $1.70 |
| Feb 2019 | 3.5 | $1.70 |
| Jan 2016 | 3.5 | $1.35 |
| May 2022 | 2.5 | $1.90 |
| Jul 2011 | 2.0 | $1.10 |
| Dec 2007 | 2.0 | $1.90 |