| Sold | Grade | Monthly Average |
| May 2026 | 2.5 | $4.80 |
| May 2026 | 2.0 | $4.00 |
| Jun 2026 | 1.8 | $3.20 |
| Apr 2010 | 7.5 | $35.50 |
| Sep 2014 | 6.0 | $23.25 |
| Dec 2025 | 4.5 | $5.85 |
| Mar 2024 | 4.0 | $14.50 |
| Mar 2022 | 4.0 | $16.00 |
| Oct 2014 | 4.0 | $17.30 |
| Sep 2019 | 3.5 | $12.75 |
| Sep 2021 | 3.0 | $13.00 |
| Oct 2019 | 2.5 | $9.60 |
| Jun 2014 | 2.5 | $10.35 |
| Sep 2010 | 2.5 | $9.60 |
| Mar 2021 | 2.0 | $8.00 |
| Nov 2012 | 2.0 | $8.00 |
| Jan 2022 | 1.0 | $4.00 |