| Sold | Grade | Monthly Average |
| Feb 2011 | 6.5 | $11.75 |
| Dec 2019 | 6.0 | $11.40 |
| Jan 2010 | 6.0 | $10.75 |
| Jun 2012 | 5.0 | $8.95 |
| Jun 2011 | 4.5 | $7.20 |
| Jun 2020 | 4.0 | $8.75 |
| Sep 2018 | 4.0 | $8.80 |
| Aug 2018 | 4.0 | $8.36 |
| Dec 2015 | 4.0 | $8.80 |
| Jul 2012 | 4.0 | $6.60 |
| Nov 2021 | 3.5 | $6.40 |
| Sep 2016 | 3.5 | $7.60 |
| Apr 2014 | 3.5 | $5.42 |
| Mar 2025 | 3.0 | $9.30 |
| May 2023 | 3.0 | $5.60 |
| May 2018 | 3.0 | $6.37 |
| Feb 2018 | 3.0 | $6.70 |
| May 2023 | 2.5 | $4.80 |
| Jul 2025 | 2.0 | $6.60 |
| Nov 2010 | 2.0 | $3.60 |
| Apr 2014 | 1.8 | $3.10 |
| Oct 2012 | 1.8 | $3.60 |