| Date | Value |
|---|---|
| Dec 8, 2020 22:57 | 0.25 ppm |
| Dec 3, 2020 12:07 | 2.5 ppm |
| Dec 2, 2020 18:20 | 0.00 ppm |
| Oct 4, 2020 09:47 | 0.00 ppm |
| Sep 12, 2020 02:05 | 1 ppm |
| Aug 26, 2020 02:05 | 5 ppm |
| Aug 6, 2020 02:05 | 5 ppm |
| Jul 30, 2020 02:05 | 20 ppm |
| Jul 25, 2020 02:05 | 80 ppm |
| Jul 20, 2020 01:03 | 80 ppm |