| Sold | Grade | Monthly Average |
| Apr 2010 | 6.5 | $19.25 |
| Feb 2015 | 6.0 | $11.00 |
| Feb 2012 | 6.0 | $17.90 |
| Nov 2022 | 5.0 | $7.56 |
| Oct 2022 | 5.0 | $8.40 |
| Mar 2016 | 4.5 | $8.80 |
| Jan 2013 | 4.5 | $5.99 |
| Dec 2010 | 4.0 | $6.20 |
| Apr 2019 | 3.5 | $4.80 |
| Jul 2012 | 3.0 | $2.47 |
| Dec 2009 | 3.0 | $4.70 |
| Apr 2021 | 2.5 | $4.80 |
| Jul 2020 | 2.0 | $3.80 |
| Jan 2019 | 2.0 | $3.00 |
| Mar 2013 | 2.0 | $2.75 |
| Jul 2021 | 1.8 | $3.20 |
| Mar 2013 | 1.0 | $2.65 |