| Sold | Grade | Monthly Average |
| May 2026 | 3.5 | $20.00 |
| May 2026 | 2.5 | $7.60 |
| Apr 2020 | 5.5 | $28.50 |
| Jul 2012 | 5.0 | $8.60 |
| May 2025 | 4.0 | $12.11 |
| Jul 2022 | 4.0 | $12.75 |
| Apr 2010 | 4.0 | $6.40 |
| Sep 2015 | 3.0 | $8.70 |
| Feb 2015 | 3.0 | $8.70 |
| Apr 2024 | 2.5 | $7.60 |
| Jun 2022 | 2.5 | $7.60 |
| Jan 2017 | 2.5 | $6.70 |
| Dec 2023 | 2.0 | $6.40 |
| Oct 2022 | 2.0 | $6.40 |
| Oct 2021 | 2.0 | $6.40 |
| May 2021 | 2.0 | $6.40 |
| Jul 2013 | 2.0 | $3.20 |
| Mar 2013 | 1.0 | $1.60 |