| Sold | Grade | Monthly Average |
| Dec 2010 | 6.0 | $16.75 |
| May 2020 | 5.5 | $76.00 |
| Nov 2016 | 5.5 | $79.00 |
| Aug 2023 | 5.0 | $115.00 |
| Feb 2025 | 4.5 | $120.00 |
| Oct 2023 | 4.5 | $99.00 |
| Oct 2024 | 4.0 | $44.00 |
| Jul 2022 | 4.0 | $86.00 |
| Jul 2020 | 4.0 | $80.00 |
| Dec 2018 | 3.5 | $70.00 |
| Jan 2025 | 2.5 | $60.00 |
| Oct 2015 | 1.0 | $3.20 |