| Sold | Grade | Monthly Average |
| Feb 2012 | 5.0 | $7.49 |
| Sep 2011 | 4.5 | $6.90 |
| Jul 2013 | 4.0 | $6.30 |
| Oct 2025 | 3.5 | $138.00 |
| Apr 2017 | 3.5 | $7.30 |
| Aug 2010 | 3.5 | $5.49 |
| Jul 2017 | 3.0 | $9.75 |
| Sep 2017 | 2.5 | $5.49 |
| Nov 2013 | 2.5 | $4.10 |
| Jan 2011 | 2.5 | $4.10 |
| Sep 2024 | 2.0 | $86.00 |
| Oct 2018 | 2.0 | $5.70 |
| Mar 2017 | 2.0 | $4.60 |