| Sold | Grade | Monthly Average |
| Aug 2026 | 4.0 | $3.60 |
| May 2026 | 4.0 | $3.42 |
| Feb 2010 | 7.5 | $9.98 |
| Apr 2016 | 5.5 | $6.17 |
| Jan 2011 | 5.5 | $4.00 |
| Nov 2025 | 5.0 | $4.30 |
| Mar 2011 | 4.5 | $3.30 |
| Oct 2024 | 4.0 | $7.20 |
| Feb 2024 | 4.0 | $7.20 |
| Sep 2023 | 4.0 | $7.20 |
| Jun 2021 | 4.0 | $4.80 |
| Jul 2019 | 4.0 | $4.80 |
| Feb 2014 | 4.0 | $3.25 |
| Aug 2013 | 3.5 | $2.40 |
| Jun 2011 | 3.0 | $2.10 |
| Feb 2011 | 3.0 | $2.10 |
| Dec 2012 | 2.5 | $1.80 |
| May 2019 | 2.0 | $3.00 |
| Sep 2016 | 2.0 | $2.40 |
| Oct 2020 | 1.8 | $2.00 |
| Aug 2025 | 1.5 | $5.00 |
| Jun 2022 | 1.5 | $2.49 |