| Date | Value |
|---|---|
| Aug 4, 2019 10:36 | 2 ppm |
| Jul 28, 2019 10:50 | 5 ppm |
| Jul 20, 2019 19:43 | 5 ppm |
| Jul 13, 2019 11:39 | 5 ppm |
| Jul 9, 2019 19:54 | 5 ppm |
| Jul 2, 2019 19:57 | 5 ppm |
| Jun 30, 2019 14:11 | 0.00 ppm |
| Jun 23, 2019 20:52 | 20 ppm |
| Mar 23, 2019 17:14 | 20 ppm |
| Mar 10, 2019 14:26 | 15 ppm |
| Mar 7, 2019 12:30 | 10 ppm |
| Mar 1, 2019 07:41 | 4 ppm |
| Jan 31, 2019 15:06 | 1 ppm |
| Jan 17, 2019 15:12 | 2 ppm |
| Dec 17, 2018 14:24 | 5 ppm |