| Sold | Grade | Monthly Average |
| Dec 2010 | 7.5 | $14.00 |
| Jul 2016 | 6.0 | $13.00 |
| Aug 2017 | 5.0 | $10.50 |
| Mar 2011 | 5.0 | $7.90 |
| Jun 2011 | 4.5 | $7.20 |
| Sep 2025 | 4.0 | $8.00 |
| Feb 2025 | 4.0 | $7.60 |
| Oct 2018 | 4.0 | $8.80 |
| Jun 2010 | 4.0 | $6.60 |
| Jan 2018 | 3.5 | $7.60 |
| Sep 2024 | 2.0 | $4.00 |
| Mar 2024 | 2.0 | $3.80 |
| Jan 2023 | 2.0 | $4.00 |
| Sep 2019 | 1.8 | $3.20 |
| Mar 2012 | 1.0 | $2.20 |