| Sold | Grade | Monthly Average |
| Feb 2011 | 6.0 | $9.00 |
| Jul 2022 | 4.0 | $6.60 |
| Nov 2020 | 4.0 | $5.94 |
| Jul 2020 | 4.0 | $6.60 |
| May 2011 | 4.0 | $6.00 |
| Jan 2010 | 4.0 | $8.36 |
| Feb 2011 | 3.5 | $5.20 |
| Jun 2013 | 3.0 | $4.60 |
| Jan 2011 | 2.5 | $3.30 |
| May 2018 | 2.0 | $3.42 |
| Jun 2013 | 2.0 | $3.30 |
| Dec 2012 | 2.0 | $3.30 |
| Jan 2021 | 1.0 | $2.00 |