| Sold | Grade | Monthly Average |
| Dec 2011 | 7.5 | $7.20 |
| Dec 2023 | 6.0 | $6.00 |
| Aug 2018 | 6.0 | $6.50 |
| Aug 2018 | 4.0 | $3.80 |
| Apr 2013 | 3.5 | $3.20 |
| Jun 2019 | 3.0 | $2.66 |
| Nov 2018 | 3.0 | $3.10 |
| Jun 2017 | 3.0 | $2.80 |
| Sep 2016 | 3.0 | $2.80 |
| Nov 2012 | 3.0 | $2.80 |
| Feb 2020 | 2.0 | $2.00 |
| Mar 2010 | 2.0 | $1.49 |