| Sold | Grade | Monthly Average |
| Jul 2026 | 1.5 | $3.30 |
| Jan 2024 | 5.0 | $6.20 |
| Mar 2023 | 5.0 | $11.00 |
| Jun 2025 | 4.0 | $9.60 |
| Dec 2011 | 4.0 | $12.00 |
| Aug 2010 | 4.0 | $7.20 |
| Nov 2018 | 3.5 | $5.70 |
| Mar 2015 | 3.0 | $5.40 |
| Jun 2011 | 3.0 | $5.00 |
| Apr 2019 | 2.5 | $4.70 |
| Feb 2016 | 2.5 | $4.30 |
| May 2022 | 2.0 | $4.80 |
| Oct 2021 | 2.0 | $6.00 |
| Nov 2017 | 2.0 | $3.24 |
| Nov 2014 | 2.0 | $2.25 |
| Jun 2011 | 2.0 | $3.60 |
| Aug 2016 | 1.5 | $3.10 |
| Dec 2024 | 1.0 | $2.50 |
| Jun 2019 | 1.0 | $3.00 |