| Date | Value |
|---|---|
| Sep 3, 2016 10:26 | 381 ppm |
| Aug 7, 2016 10:53 | 518 ppm |
| Jun 21, 2016 13:59 | 546 ppm |
| May 16, 2016 18:02 | 574 ppm |
| May 3, 2016 20:51 | 600 ppm |
| Apr 26, 2016 23:19 | 570 ppm |
| Apr 15, 2016 22:48 | 487 ppm |
| Apr 10, 2016 16:35 | 600 ppm |
| Apr 6, 2016 17:54 | 570 ppm |
| Apr 6, 2016 17:00 | 566 ppm |
| Apr 6, 2016 00:48 | 600 ppm |