| Sold | Grade | Monthly Average |
| Jan 2012 | 9.4 | $6.30 |
| Nov 2016 | 8.0 | $4.80 |
| Feb 2016 | 8.0 | $4.80 |
| Apr 2013 | 8.0 | $0.90 |
| May 2011 | 8.0 | $0.90 |
| Mar 2010 | 8.0 | $1.00 |
| Oct 2009 | 8.0 | $0.80 |
| Aug 2009 | 8.0 | $0.80 |
| Sep 2006 | 8.0 | $3.20 |
| Apr 2020 | 6.0 | $2.00 |
| Feb 2019 | 6.0 | $1.70 |
| Jul 2018 | 6.0 | $1.70 |
| Oct 2016 | 6.0 | $4.10 |
| May 2016 | 6.0 | $6.01 |
| Oct 2015 | 6.0 | $3.90 |
| Oct 2014 | 4.0 | $2.00 |