| Sold | Grade | Monthly Average |
| Feb 2011 | 7.0 | $13.75 |
| Feb 2020 | 6.0 | $9.90 |
| Apr 2020 | 5.5 | $8.90 |
| Feb 2026 | 4.5 | $7.20 |
| Oct 2018 | 4.5 | $8.00 |
| Jan 2018 | 4.5 | $8.00 |
| Nov 2025 | 4.0 | $6.60 |
| Jan 2023 | 4.0 | $6.60 |
| May 2022 | 4.0 | $6.27 |
| Oct 2013 | 3.5 | $5.20 |
| Aug 2017 | 3.0 | $4.14 |
| Sep 2025 | 2.0 | $3.30 |
| Mar 2019 | 2.0 | $3.30 |
| Sep 2018 | 2.0 | $3.30 |
| Apr 2016 | 2.0 | $4.10 |
| May 2015 | 2.0 | $4.00 |
| Mar 2017 | 1.8 | $2.60 |
| Mar 2012 | 1.0 | $1.80 |