| Date | Value |
|---|---|
| Aug 8, 2018 00:25 | 430 ppm |
| Jul 20, 2018 00:33 | 400 ppm |
| Jul 11, 2018 22:42 | 400 ppm |
| Jul 5, 2018 23:41 | 470 ppm |
| Jul 2, 2018 23:10 | 410 ppm |
| Jun 20, 2018 23:30 | 500 ppm |
| Jun 20, 2018 23:30 | 400 ppm |
| Jun 13, 2018 23:45 | 460 ppm |
| Jun 5, 2018 22:50 | 430 ppm |
| Jun 5, 2018 00:17 | 350 ppm |
| Jun 2, 2018 00:51 | 450 ppm |
| May 29, 2018 01:12 | 380 ppm |
| May 28, 2018 01:50 | 430 ppm |
| May 22, 2018 01:27 | 380 ppm |