| Sold | Grade | Monthly Average |
| Jul 2025 | 1.5 | $2.70 |
| Mar 2014 | 8.0 | $10.80 |
| Mar 2011 | 7.5 | $8.00 |
| Mar 2023 | 6.0 | $9.00 |
| Dec 2010 | 6.0 | $6.00 |
| Jul 2012 | 5.0 | $4.80 |
| Feb 2023 | 4.5 | $6.60 |
| Nov 2017 | 4.0 | $3.16 |
| Aug 2014 | 4.0 | $5.30 |
| Aug 2013 | 4.0 | $4.00 |
| May 2013 | 4.0 | $4.00 |
| Jan 2016 | 3.5 | $5.20 |
| Nov 2014 | 3.0 | $4.45 |
| Feb 2020 | 2.5 | $3.99 |
| Apr 2024 | 2.0 | $3.30 |
| Mar 2024 | 2.0 | $3.30 |
| May 2019 | 2.0 | $3.14 |
| Feb 2018 | 2.0 | $3.14 |
| Jul 2012 | 2.0 | $2.20 |
| Sep 2015 | 1.8 | $2.66 |
| Oct 2010 | 1.8 | $1.90 |