| Sold | Grade | Monthly Average |
| Jul 2014 | 9.4 | $4.65 |
| Jan 2013 | 9.4 | $5.15 |
| Jan 2012 | 9.4 | $3.30 |
| Feb 2011 | 9.4 | $4.70 |
| Oct 2010 | 9.4 | $4.70 |
| Jan 2017 | 8.0 | $2.40 |
| Dec 2016 | 8.0 | $1.80 |
| Jan 2016 | 8.0 | $1.35 |
| Aug 2012 | 8.0 | $3.40 |
| Mar 2024 | 6.0 | $2.50 |
| Mar 2021 | 6.0 | $2.00 |
| May 2018 | 6.0 | $1.70 |
| Mar 2015 | 6.0 | $2.15 |
| Nov 2014 | 6.0 | $2.60 |
| Oct 2018 | 4.0 | $1.70 |
| Jul 2018 | 4.0 | $1.70 |