| Date | Value |
|---|---|
| Oct 7, 2020 05:40 | 595 ppm |
| Sep 19, 2020 22:27 | 528 ppm |
| Sep 12, 2020 01:49 | 530 ppm |
| Sep 8, 2020 22:00 | 551 ppm |
| Sep 2, 2020 02:32 | 570 ppm |
| Aug 26, 2020 23:09 | 560 ppm |
| Aug 26, 2020 00:09 | 554 ppm |
| Aug 22, 2020 23:00 | 541 ppm |
| Jul 18, 2020 06:26 | 430 ppm |
| Jul 10, 2020 10:26 | 430 ppm |