| Date | Value |
|---|---|
| May 23, 2020 19:18 | 0.00 ppm |
| May 13, 2020 00:54 | 0.00 ppm |
| May 4, 2020 22:34 | 5 ppm |
| Apr 26, 2020 20:32 | 0.00 ppm |
| Apr 22, 2020 19:26 | 0.00 ppm |
| Apr 18, 2020 14:55 | 0.00 ppm |
| Apr 17, 2020 20:10 | 0.00 ppm |
| Apr 16, 2020 21:50 | 0.00 ppm |
| Apr 16, 2020 18:09 | 0.00 ppm |