| Date | Value |
|---|---|
| Mar 10, 2021 00:17 | 420 ppm |
| Feb 10, 2021 16:45 | 435 ppm |
| Jan 20, 2021 19:04 | 445 ppm |
| Dec 28, 2020 17:20 | 455 ppm |
| Dec 8, 2020 13:22 | 445 ppm |
| Nov 24, 2020 21:12 | 440 ppm |
| Nov 16, 2020 20:38 | 455 ppm |
| Jul 30, 2020 06:32 | 465 ppm |
| May 17, 2020 15:44 | 465 ppm |
| Feb 24, 2020 21:36 | 450 ppm |
| Jan 16, 2020 22:06 | 420 ppm |