| Date | Value |
|---|---|
| Jul 14, 2018 21:18 | 424 ppm |
| Jul 11, 2018 17:31 | 512 ppm |
| Jul 10, 2018 21:49 | 510 ppm |
| Jul 1, 2018 10:55 | 420 ppm |
| Jun 27, 2018 17:35 | 461 ppm |
| Jun 26, 2018 20:51 | 495 ppm |
| Jun 8, 2018 21:17 | 462 ppm |
| May 15, 2018 17:42 | 511 ppm |
| May 8, 2018 22:41 | 400 ppm |
| May 7, 2018 22:41 | 460 ppm |
| May 2, 2018 22:51 | 400 ppm |
| Apr 30, 2018 17:15 | 420 ppm |
| Apr 28, 2018 23:34 | 440 ppm |
| Apr 24, 2018 23:34 | 340 ppm |
| Apr 21, 2018 23:33 | 400 ppm |