| Sold | Grade | Monthly Average |
| Oct 2020 | 6.0 | $6.00 |
| Apr 2025 | 5.0 | $4.80 |
| Feb 2021 | 5.0 | $4.80 |
| Aug 2010 | 4.5 | $4.40 |
| Aug 2022 | 4.0 | $4.00 |
| Jul 2021 | 4.0 | $4.00 |
| Jun 2019 | 4.0 | $4.40 |
| Feb 2018 | 4.0 | $4.40 |
| Dec 2012 | 3.5 | $3.50 |
| Jul 2010 | 2.5 | $2.10 |
| Sep 2025 | 2.0 | $2.65 |
| Sep 2023 | 2.0 | $2.50 |
| Mar 2022 | 2.0 | $2.00 |
| Mar 2018 | 2.0 | $1.90 |
| Sep 2025 | 1.0 | $2.65 |
| May 2021 | 1.0 | $2.00 |
| Sep 2016 | 1.0 | $1.35 |
| Dec 2014 | 0.5 | $1.20 |
| Nov 2014 | 0.5 | $1.20 |