| Date | Value |
|---|---|
| Aug 24, 2020 15:07 | 20 ppm |
| Apr 4, 2019 17:30 | 10 ppm |
| Mar 17, 2019 11:29 | 5 ppm |
| Feb 26, 2019 10:12 | 10 ppm |
| Jan 14, 2019 11:35 | 20 ppm |
| Jan 4, 2019 11:34 | 10 ppm |
| Dec 4, 2018 06:32 | 20 ppm |
| Nov 28, 2018 11:28 | 5 ppm |
| Nov 11, 2018 11:25 | 5 ppm |
| Nov 9, 2018 11:24 | 5 ppm |