| Sold | Grade | Monthly Average |
| Jan 2024 | 7.5 | $6.40 |
| Jan 2011 | 7.5 | $1.90 |
| Apr 2019 | 6.0 | $2.60 |
| Jun 2013 | 6.0 | $1.60 |
| May 2023 | 4.0 | $2.50 |
| Feb 2022 | 4.0 | $2.00 |
| Nov 2011 | 4.0 | $1.10 |
| May 2011 | 4.0 | $1.10 |
| Mar 2011 | 4.0 | $1.10 |
| Oct 2009 | 4.0 | $1.60 |
| Sep 2008 | 4.0 | $1.80 |
| Sep 2016 | 3.5 | $1.35 |
| Jun 2022 | 3.0 | $2.00 |
| Jan 2020 | 3.0 | $2.00 |
| Sep 2016 | 2.5 | $1.35 |
| Mar 2012 | 2.0 | $1.10 |
| Jan 2017 | 1.5 | $1.70 |