| Sold | Grade | Monthly Average |
| Mar 2024 | 7.5 | $7.49 |
| Sep 2017 | 9.4 | $6.00 |
| Oct 2013 | 9.4 | $3.70 |
| Jan 2013 | 9.4 | $2.30 |
| Jan 2012 | 9.4 | $3.00 |
| Feb 2010 | 9.4 | $1.98 |
| Sep 2009 | 9.4 | $3.49 |
| Jun 2008 | 9.4 | $5.60 |
| May 2008 | 9.4 | $5.60 |
| Sep 2007 | 9.4 | $5.60 |
| Dec 2006 | 9.4 | $5.04 |
| Jun 2006 | 9.4 | $7.00 |
| Mar 2016 | 8.0 | $3.40 |
| Feb 2014 | 8.0 | $4.10 |