| Date | Value |
|---|---|
| Dec 10, 2022 02:44 | 400 ppm |
| Nov 9, 2021 07:51 | 400 ppm |
| Nov 6, 2021 04:07 | 405 ppm |
| Oct 26, 2021 23:29 | 380 ppm |
| Jul 15, 2021 08:22 | 400 ppm |
| Dec 18, 2020 04:45 | 390 ppm |
| Dec 12, 2020 07:49 | 400 ppm |
| Dec 6, 2020 01:17 | 360 ppm |
| Dec 4, 2020 06:54 | 360 ppm |
| Dec 3, 2020 10:17 | 350 ppm |
| Dec 1, 2020 08:33 | 340 ppm |