| Date | Value |
|---|---|
| Jan 9, 2024 22:49 | 420 ppm |
| Nov 18, 2022 23:41 | 440 ppm |
| Oct 12, 2022 15:23 | 440 ppm |
| Sep 9, 2020 17:56 | 400 ppm |
| Sep 5, 2020 13:52 | 395 ppm |
| Aug 27, 2020 13:44 | 375 ppm |
| Aug 24, 2020 14:14 | 380 ppm |
| Aug 12, 2020 19:04 | 350 ppm |
| Aug 11, 2020 14:18 | 345 ppm |
| Jul 24, 2020 19:49 | 325 ppm |
| Apr 18, 2020 16:37 | 385 ppm |
| Jan 21, 2020 21:34 | 440 ppm |