| Sold | Grade | Monthly Average |
| May 2014 | 9.4 | $12.95 |
| Jun 2013 | 9.4 | $10.50 |
| Feb 2012 | 9.2 | $11.20 |
| Jul 2014 | 8.5 | $8.49 |
| Feb 2014 | 8.5 | $8.49 |
| Dec 2020 | 8.0 | $4.00 |
| Nov 2015 | 8.0 | $2.90 |
| Nov 2013 | 8.0 | $8.70 |
| Jul 2013 | 8.0 | $8.80 |
| Apr 2013 | 8.0 | $8.00 |
| Mar 2013 | 8.0 | $7.60 |
| Feb 2012 | 8.0 | $9.00 |
| Sep 2013 | 7.0 | $4.20 |
| Jul 2020 | 6.0 | $3.30 |
| Sep 2015 | 6.0 | $1.80 |
| Oct 2013 | 6.0 | $6.00 |