| Sold | Grade | Monthly Average |
| Apr 2019 | 9.4 | $11.00 |
| May 2018 | 9.4 | $9.95 |
| Nov 2015 | 9.4 | $9.95 |
| Oct 2014 | 9.4 | $11.75 |
| Feb 2014 | 9.4 | $9.95 |
| Sep 2013 | 9.4 | $9.95 |
| May 2012 | 9.4 | $10.00 |
| Sep 2011 | 9.4 | $10.80 |
| Jun 2011 | 9.4 | $12.00 |
| Oct 2010 | 9.4 | $11.75 |
| Jun 2010 | 9.4 | $11.75 |
| Nov 2009 | 9.4 | $11.75 |
| Jul 2009 | 9.4 | $15.99 |
| Mar 2021 | 8.0 | $7.99 |
| Jan 2021 | 8.0 | $7.99 |
| Oct 2020 | 8.0 | $7.99 |
| Dec 2018 | 6.0 | $6.50 |
| Dec 2009 | 6.0 | $6.48 |
| May 2024 | 4.0 | $8.00 |
| Jan 2018 | 4.0 | $4.40 |
| Feb 2015 | 4.0 | $3.99 |