| Date | Value |
|---|---|
| Jul 10, 2018 17:44 | 10 ppm |
| Jul 18, 2017 21:58 | 80 ppm |
| May 25, 2016 18:45 | 5 ppm |
| May 21, 2016 19:09 | 5 ppm |
| May 19, 2016 19:25 | 0.00 ppm |
| May 17, 2016 19:13 | 5 ppm |
| May 14, 2016 16:59 | 5 ppm |
| May 12, 2016 19:58 | 5 ppm |
| May 6, 2016 15:07 | 5 ppm |
| May 3, 2016 19:24 | 2 ppm |
| May 3, 2016 19:24 | 0.25 ppm |