| Date | Value |
|---|---|
| Sep 4, 2016 17:36 | 420 ppm |
| Aug 23, 2016 20:51 | 425 ppm |
| Aug 18, 2016 01:31 | 430 ppm |
| Aug 18, 2016 01:31 | 430 ppm |
| Aug 13, 2016 22:52 | 410 ppm |
| Aug 10, 2016 23:43 | 435 ppm |
| Aug 5, 2016 18:17 | 415 ppm |
| Aug 3, 2016 20:46 | 415 ppm |
| Jul 17, 2016 16:08 | 440 ppm |
| Jul 10, 2016 18:06 | 425 ppm |