| Sold | Grade | Monthly Average |
| Dec 2025 | 4.5 | $26.00 |
| Apr 2016 | 4.5 | $9.50 |
| Jun 2010 | 4.5 | $6.60 |
| Jan 2010 | 4.5 | $6.60 |
| Oct 2013 | 4.0 | $6.00 |
| Apr 2011 | 4.0 | $5.70 |
| Dec 2025 | 3.5 | $9.00 |
| Dec 2017 | 3.0 | $6.10 |
| Mar 2011 | 2.5 | $3.99 |
| Nov 2015 | 2.0 | $2.80 |
| Oct 2017 | 1.8 | $2.49 |
| Oct 2013 | 1.5 | $2.70 |
| Jan 2018 | 0.5 | $1.70 |
| May 2016 | 0.5 | $1.35 |