| Date | Value |
|---|---|
| Mar 9, 2018 17:52 | 0.00 ppm |
| Mar 3, 2018 21:14 | 0.00 ppm |
| Feb 18, 2018 02:04 | 0.00 ppm |
| Aug 27, 2017 22:13 | 2.8 ppm |
| Aug 26, 2017 22:13 | 3 ppm |
| Aug 23, 2017 22:13 | 3.2 ppm |
| Aug 22, 2017 22:13 | 3.2 ppm |
| Aug 21, 2017 22:13 | 3.8 ppm |
| Aug 19, 2017 22:13 | 4 ppm |
| Aug 17, 2017 22:13 | 4 ppm |