| Sold | Grade | Monthly Average |
| Oct 2013 | 6.5 | $35.00 |
| Jul 2015 | 6.0 | $31.00 |
| Feb 2010 | 6.0 | $15.00 |
| Dec 2009 | 6.0 | $13.50 |
| Aug 2012 | 3.5 | $10.85 |
| Mar 2020 | 3.0 | $7.70 |
| Feb 2019 | 2.0 | $5.49 |
| Sep 2018 | 2.0 | $5.49 |
| Jun 2017 | 1.5 | $4.49 |
| Oct 2019 | 1.0 | $3.20 |
| May 2018 | 1.0 | $3.20 |
| Nov 2020 | 0.5 | $2.00 |