| Sold | Grade | Monthly Average |
| May 2012 | 6.0 | $9.00 |
| Sep 2018 | 5.5 | $8.90 |
| Apr 2017 | 4.5 | $7.20 |
| Aug 2025 | 4.0 | $6.60 |
| Jan 2018 | 4.0 | $6.50 |
| Apr 2016 | 4.0 | $11.00 |
| Aug 2011 | 4.0 | $6.00 |
| Feb 2012 | 3.5 | $5.80 |
| May 2022 | 2.0 | $3.60 |
| May 2021 | 2.0 | $3.42 |
| Nov 2018 | 2.0 | $3.42 |
| Oct 2015 | 2.0 | $3.60 |
| Jan 2015 | 2.0 | $4.49 |
| Mar 2013 | 2.0 | $3.30 |
| Jan 2011 | 2.0 | $3.30 |
| Oct 2010 | 2.0 | $3.30 |
| Jun 2013 | 1.8 | $3.10 |