| Sold | Grade | Monthly Average |
| Jan 2019 | 6.5 | $6.00 |
| May 2012 | 5.5 | $9.70 |
| Jan 2010 | 5.5 | $7.98 |
| Jan 2025 | 5.0 | $10.00 |
| Jul 2022 | 5.0 | $8.00 |
| Aug 2023 | 4.5 | $3.60 |
| Jan 2023 | 4.0 | $8.80 |
| Aug 2021 | 4.0 | $3.30 |
| Sep 2023 | 3.0 | $2.38 |
| Dec 2025 | 2.5 | $2.39 |
| Oct 2023 | 2.5 | $2.50 |
| Dec 2010 | 2.0 | $3.60 |
| Sep 2017 | 1.8 | $3.10 |
| Dec 2019 | 1.5 | $1.90 |
| Mar 2016 | 1.0 | $1.99 |
| Dec 2009 | 0.5 | $0.70 |