| Date | Value |
|---|---|
| Feb 26, 2021 22:58 | 440 ppm |
| Feb 15, 2021 19:22 | 420 ppm |
| Feb 8, 2021 22:18 | 410 ppm |
| Jan 25, 2021 15:59 | 430 ppm |
| Jan 24, 2021 14:35 | 410 ppm |
| Jan 21, 2021 16:30 | 440 ppm |
| Jan 11, 2021 01:36 | 420 ppm |
| Dec 18, 2020 19:51 | 420 ppm |
| Nov 25, 2020 22:32 | 340 ppm |
| Nov 16, 2020 22:26 | 400 ppm |
| Nov 13, 2020 17:35 | 360 ppm |
| Nov 12, 2020 21:17 | 340 ppm |
| Nov 12, 2020 20:45 | 340 ppm |