| Sold | Grade | Monthly Average |
| May 2020 | 9.4 | $3.30 |
| Mar 2014 | 9.4 | $2.20 |
| Oct 2013 | 9.4 | $2.20 |
| Jul 2011 | 9.4 | $2.20 |
| Jun 2010 | 9.4 | $1.70 |
| Mar 2008 | 9.4 | $2.40 |
| Aug 2005 | 9.4 | $2.40 |
| Mar 2004 | 9.4 | $2.00 |
| Oct 2002 | 9.4 | $2.50 |
| Aug 2016 | 8.0 | $2.40 |
| Aug 2013 | 8.0 | $1.85 |
| Jan 2024 | 6.0 | $3.60 |
| Dec 2023 | 6.0 | $3.00 |
| Mar 2023 | 6.0 | $3.00 |
| May 2020 | 6.0 | $2.00 |
| May 2019 | 6.0 | $1.80 |
| Mar 2017 | 6.0 | $3.30 |
| Aug 2016 | 6.0 | $1.80 |
| Jun 2011 | 6.0 | $1.30 |
| Nov 2025 | 4.5 | $4.70 |
| Sep 2019 | 3.0 | $1.70 |
| Apr 2018 | 2.0 | $1.70 |