| Sold | Grade | Monthly Average |
| May 2017 | 5.0 | $6.54 |
| May 2020 | 4.5 | $9.50 |
| Jan 2019 | 4.0 | $9.10 |
| Nov 2017 | 4.0 | $2.52 |
| Jul 2020 | 3.5 | $5.49 |
| Jun 2023 | 2.5 | $4.80 |
| Apr 2019 | 2.0 | $4.27 |
| Mar 2015 | 2.0 | $2.10 |
| Jan 2010 | 2.0 | $3.98 |
| Nov 2014 | 1.8 | $1.20 |
| Dec 2013 | 1.8 | $1.15 |
| Mar 2014 | 1.5 | $1.49 |
| Feb 2015 | 1.0 | $1.10 |
| Mar 2010 | 1.0 | $2.00 |