| Sold | Grade | Monthly Average |
| Feb 2026 | 2.5 | $4.30 |
| May 2012 | 6.0 | $9.00 |
| Dec 2019 | 4.5 | $6.60 |
| Sep 2025 | 4.0 | $8.00 |
| Dec 2024 | 4.0 | $6.00 |
| Dec 2019 | 4.0 | $6.00 |
| May 2017 | 3.0 | $4.60 |
| Sep 2011 | 3.0 | $4.60 |
| Sep 2010 | 2.5 | $3.99 |
| Dec 2019 | 2.0 | $3.30 |
| May 2018 | 2.0 | $3.30 |
| Sep 2016 | 2.0 | $3.30 |
| Jun 2019 | 1.8 | $2.80 |
| Sep 2014 | 1.8 | $2.80 |
| Mar 2018 | 1.0 | $1.71 |