| Date | Value |
|---|---|
| Jan 29, 2018 19:38 | 15 ppm |
| Oct 1, 2016 09:42 | 0.10 ppm |
| Jul 15, 2016 03:55 | 0.30 ppm |
| Jun 29, 2016 12:50 | 0.10 ppm |
| Apr 3, 2016 08:49 | 25 ppm |
| Mar 25, 2016 13:28 | 15 ppm |
| Mar 20, 2016 08:24 | 25 ppm |
| Mar 19, 2016 04:48 | 50 ppm |
| Mar 14, 2016 09:40 | 50 ppm |
| Mar 12, 2016 18:14 | 25 ppm |
| Mar 7, 2016 18:10 | 35 ppm |