| Sold | Grade | Monthly Average |
| Jan 2010 | 9.4 | $9.49 |
| Oct 2011 | 9.2 | $15.00 |
| Oct 2018 | 8.5 | $25.00 |
| Oct 2015 | 8.5 | $12.11 |
| Sep 2010 | 8.5 | $6.70 |
| Dec 2009 | 8.5 | $3.40 |
| Apr 2022 | 8.0 | $40.00 |
| Jul 2018 | 8.0 | $11.40 |
| Apr 2013 | 8.0 | $12.00 |
| Sep 2020 | 7.5 | $11.25 |
| Dec 2016 | 7.5 | $16.00 |
| Jul 2015 | 7.5 | $11.25 |
| Dec 2011 | 7.5 | $11.90 |
| Aug 2020 | 7.0 | $10.50 |
| Jan 2020 | 7.0 | $10.50 |
| Jun 2014 | 6.5 | $9.70 |
| Jan 2021 | 6.0 | $9.00 |
| Mar 2017 | 6.0 | $9.00 |