| Sold | Grade | Monthly Average |
| Sep 2015 | 9.4 | $5.00 |
| Jul 2014 | 9.4 | $5.49 |
| Jan 2013 | 9.4 | $4.00 |
| Nov 2012 | 9.4 | $3.70 |
| Apr 2012 | 9.4 | $5.30 |
| Feb 2010 | 9.4 | $1.30 |
| Jan 2010 | 9.4 | $1.30 |
| Dec 2009 | 9.4 | $1.98 |
| May 2008 | 9.4 | $5.76 |
| Jan 2007 | 9.4 | $6.40 |
| Dec 2020 | 8.0 | $4.80 |
| Dec 2019 | 8.0 | $4.80 |
| May 2015 | 8.0 | $3.20 |