| Date | Value |
|---|---|
| Jun 30, 2021 14:35 | 458 ppm |
| Jun 18, 2021 15:26 | 443 ppm |
| Jun 14, 2021 14:30 | 407 ppm |
| Jun 2, 2021 15:17 | 462 ppm |
| May 24, 2021 15:31 | 391 ppm |
| Mar 24, 2021 19:15 | 496 ppm |
| Feb 25, 2021 14:53 | 490 ppm |
| Feb 5, 2021 16:47 | 422 ppm |
| Feb 4, 2021 15:52 | 359 ppm |
| Jul 21, 2020 01:04 | 490 ppm |
| Apr 25, 2020 16:48 | 482 ppm |
| Apr 22, 2020 13:34 | 490 ppm |
| Apr 3, 2020 16:14 | 484 ppm |
| Mar 31, 2020 15:17 | 499 ppm |
| Jan 18, 2020 19:38 | 451 ppm |