| Sold | Grade | Monthly Average |
| Jan 2020 | 9.4 | $2.00 |
| Oct 2012 | 9.4 | $6.49 |
| Mar 2017 | 8.0 | $6.40 |
| Nov 2016 | 8.0 | $5.20 |
| Aug 2016 | 8.0 | $2.40 |
| Sep 2015 | 8.0 | $2.40 |
| Jun 2013 | 8.0 | $6.60 |
| Nov 2012 | 8.0 | $5.60 |
| Dec 2010 | 8.0 | $4.00 |
| Sep 2020 | 6.0 | $2.00 |
| Mar 2018 | 6.0 | $1.70 |
| Dec 2016 | 6.0 | $3.90 |
| Jun 2014 | 6.0 | $1.80 |
| Apr 2013 | 6.0 | $5.10 |
| Sep 2012 | 6.0 | $4.85 |
| Oct 2013 | 4.0 | $1.30 |
| Apr 2011 | 4.0 | $2.40 |