| Date | Value |
|---|---|
| May 4, 2018 12:59 | 0.00 ppm |
| Jun 18, 2017 15:41 | 0.25 ppm |
| Mar 13, 2016 18:02 | 0.00 ppm |
| Jan 31, 2016 19:37 | 0.00 ppm |
| Jan 2, 2016 17:54 | 0.00 ppm |
| Dec 10, 2015 11:43 | 0.00 ppm |
| Nov 22, 2015 20:03 | 0.00 ppm |
| Nov 19, 2015 13:23 | 0.00 ppm |
| Nov 13, 2015 12:19 | 0.00 ppm |
| Nov 1, 2015 20:46 | 0.00 ppm |
| Oct 24, 2015 00:02 | 0.00 ppm |