| Date | Value |
|---|---|
| Jun 15, 2020 23:12 | 0.00 ppm |
| Apr 4, 2020 20:12 | 0.00 ppm |
| Apr 2, 2020 00:21 | 0.00 ppm |
| Mar 29, 2020 19:24 | 0.50 ppm |
| Mar 14, 2020 16:25 | 0.00 ppm |
| Mar 3, 2020 02:48 | 0.25 ppm |
| Feb 22, 2020 17:44 | 0.00 ppm |
| Feb 22, 2020 17:30 | 0.15 ppm |
| Feb 22, 2020 01:04 | 0.20 ppm |
| Feb 21, 2020 00:08 | 0.25 ppm |
| Feb 19, 2020 23:17 | 0.30 ppm |
| Feb 17, 2020 18:12 | 0.30 ppm |
| Feb 16, 2020 18:45 | 0.50 ppm |
| Feb 14, 2020 04:16 | 1 ppm |