| Sold | Grade | Monthly Average |
| Jun 2026 | 6.0 | $5.40 |
| Mar 2025 | 6.0 | $6.30 |
| Aug 2023 | 6.0 | $6.30 |
| Jun 2022 | 6.0 | $6.30 |
| May 2020 | 6.0 | $6.75 |
| Apr 2025 | 5.0 | $5.20 |
| Jan 2018 | 4.5 | $4.00 |
| Jun 2022 | 4.0 | $3.60 |
| Sep 2021 | 4.0 | $3.60 |
| Jul 2019 | 4.0 | $3.60 |
| Dec 2009 | 3.0 | $0.70 |
| Feb 2017 | 2.5 | $3.70 |
| Aug 2022 | 2.0 | $2.00 |