| Sold | Grade | Monthly Average |
| Nov 2026 | 4.0 | $3.20 |
| Jun 2026 | 2.0 | $2.65 |
| Nov 2011 | 6.5 | $7.20 |
| Sep 2013 | 5.0 | $4.80 |
| Jan 2024 | 4.5 | $5.20 |
| Apr 2024 | 4.0 | $5.60 |
| Dec 2022 | 4.0 | $4.56 |
| Jan 2020 | 4.0 | $4.80 |
| Jul 2017 | 4.0 | $4.00 |
| Aug 2018 | 3.5 | $3.20 |
| Jan 2024 | 3.0 | $3.30 |
| Aug 2020 | 3.0 | $3.30 |
| May 2017 | 3.0 | $2.80 |
| Oct 2024 | 2.5 | $2.80 |
| Aug 2019 | 2.5 | $2.40 |
| Jul 2018 | 2.5 | $2.40 |
| Jun 2021 | 2.0 | $2.40 |
| Jan 2021 | 2.0 | $2.40 |
| Sep 2020 | 2.0 | $2.40 |
| Aug 2012 | 2.0 | $2.00 |
| Dec 2011 | 2.0 | $2.00 |
| Jun 2014 | 1.8 | $1.60 |