| Sold | Grade | Monthly Average |
| Dec 2025 | 6.0 | $7.20 |
| Dec 2009 | 9.4 | $4.98 |
| Mar 2009 | 9.4 | $4.80 |
| May 2008 | 9.4 | $4.80 |
| Mar 2007 | 9.4 | $4.80 |
| Aug 2005 | 9.4 | $4.80 |
| Aug 2004 | 9.4 | $3.00 |
| May 2004 | 9.4 | $3.00 |
| Nov 2024 | 8.0 | $18.00 |
| Apr 2018 | 8.0 | $4.00 |
| Oct 2012 | 8.0 | $3.20 |
| Mar 2023 | 7.0 | $7.00 |
| Jan 2020 | 7.0 | $7.00 |
| Dec 2021 | 6.0 | $6.00 |
| Mar 2015 | 6.0 | $3.00 |
| Aug 2014 | 6.0 | $3.25 |
| Aug 2010 | 6.0 | $2.40 |
| May 2020 | 4.0 | $4.00 |
| Oct 2015 | 4.0 | $2.00 |
| Jan 2015 | 4.0 | $2.00 |
| Sep 2012 | 4.0 | $1.60 |