| Sold | Grade | Monthly Average |
| Nov 2009 | 6.5 | $14.25 |
| Feb 2011 | 6.0 | $8.10 |
| May 2012 | 5.5 | $7.30 |
| Mar 2010 | 5.0 | $7.20 |
| Aug 2019 | 4.5 | $6.60 |
| Jul 2020 | 4.0 | $6.50 |
| Oct 2015 | 4.0 | $5.40 |
| Jun 2013 | 4.0 | $5.40 |
| Nov 2017 | 3.5 | $2.37 |
| Feb 2014 | 3.0 | $3.90 |
| Jun 2022 | 2.0 | $3.00 |
| Apr 2020 | 2.0 | $3.00 |
| Jul 2017 | 2.0 | $1.62 |
| Jan 2021 | 1.8 | $2.28 |
| Sep 2018 | 1.8 | $2.40 |
| Jul 2018 | 1.8 | $2.40 |
| Jun 2022 | 1.0 | $1.90 |
| May 2019 | 0.5 | $1.70 |