| Date | Value |
|---|---|
| Oct 29, 2019 00:40 | 409 ppm |
| Aug 26, 2019 17:20 | 421 ppm |
| Jul 21, 2019 20:55 | 411 ppm |
| Jul 8, 2019 01:11 | 412 ppm |
| Jun 30, 2019 22:03 | 460 ppm |
| Jun 30, 2019 18:54 | 412 ppm |
| Jun 30, 2019 17:54 | 414 ppm |
| Jun 27, 2019 17:13 | 460 ppm |
| Jun 27, 2019 17:04 | 503 ppm |
| Jun 27, 2019 00:35 | 454 ppm |
| Jun 23, 2019 19:40 | 471 ppm |
| Jun 23, 2019 17:33 | 468 ppm |
| Jun 16, 2019 22:01 | 491 ppm |
| Jun 13, 2019 23:31 | 479 ppm |