| Date | Value |
|---|---|
| Aug 30, 2019 23:26 | 0.00 ppm |
| May 26, 2019 16:36 | 0.00 ppm |
| May 24, 2019 18:01 | 0.00 ppm |
| May 3, 2019 18:40 | 0.00 ppm |
| Apr 26, 2019 17:01 | 0.10 ppm |
| Apr 20, 2019 11:22 | 0.00 ppm |
| Apr 14, 2019 13:05 | 0.00 ppm |
| Apr 10, 2019 21:15 | 0.00 ppm |
| Apr 5, 2019 18:50 | 0.00 ppm |
| Apr 3, 2019 12:31 | 0.00 ppm |
| Apr 2, 2019 00:55 | 2 ppm |
| Mar 28, 2019 13:01 | 2 ppm |
| Mar 21, 2019 01:17 | 0.20 ppm |
| Mar 18, 2019 11:29 | 0.10 ppm |
| Mar 13, 2019 11:06 | 0.10 ppm |