| Date | Value |
|---|---|
| Jun 4, 2021 00:08 | 469 ppm |
| Apr 21, 2021 23:11 | 502 ppm |
| Mar 25, 2021 20:01 | 429 ppm |
| Nov 9, 2020 23:00 | 445 ppm |
| Nov 7, 2020 00:29 | 441 ppm |
| Oct 31, 2020 14:52 | 414 ppm |
| Aug 23, 2020 18:54 | 447 ppm |
| Aug 10, 2020 23:54 | 419 ppm |
| May 7, 2020 21:16 | 445 ppm |
| Apr 23, 2020 21:08 | 458 ppm |