| Sold | Grade | Monthly Average |
| Feb 2015 | 9.4 | $10.80 |
| Jun 2009 | 9.4 | $12.00 |
| May 2016 | 8.5 | $10.20 |
| Oct 2015 | 8.0 | $8.00 |
| Feb 2020 | 7.5 | $11.25 |
| Aug 2024 | 6.0 | $7.20 |
| Feb 2018 | 6.0 | $9.00 |
| Jun 2015 | 6.0 | $6.00 |
| Sep 2013 | 6.0 | $6.00 |
| Nov 2021 | 4.5 | $7.30 |
| Jul 2011 | 4.5 | $6.70 |
| May 2021 | 4.0 | $6.00 |
| Jan 2019 | 4.0 | $6.50 |
| Sep 2018 | 3.0 | $4.90 |