| Date | Value |
|---|---|
| Apr 15, 2020 18:38 | 0.00 ppm |
| Apr 4, 2020 21:44 | 0.00 ppm |
| Mar 28, 2020 21:29 | 0.00 ppm |
| Mar 23, 2020 18:30 | 0.00 ppm |
| Mar 18, 2020 05:32 | 0.00 ppm |
| Mar 17, 2020 05:32 | 0.00 ppm |
| Mar 14, 2020 05:32 | 0.00 ppm |
| Feb 29, 2020 18:07 | 0.00 ppm |
| Feb 23, 2020 21:51 | 0.00 ppm |
| Feb 21, 2020 21:40 | 0.00 ppm |
| Feb 15, 2020 03:46 | 0.50 ppm |
| Feb 8, 2020 17:58 | 1 ppm |
| Feb 6, 2020 18:12 | 2 ppm |
| Feb 4, 2020 23:39 | 1 ppm |
| Jan 28, 2020 00:44 | 2 ppm |