| Date | Value |
|---|---|
| Feb 21, 2021 18:03 | 2 ppm |
| Jan 17, 2021 18:00 | 2 ppm |
| Jan 3, 2021 18:10 | 2 ppm |
| Dec 28, 2020 11:45 | 2 ppm |
| Dec 13, 2020 18:19 | 2 ppm |
| Nov 29, 2020 18:20 | 2 ppm |
| Nov 22, 2020 17:36 | 2 ppm |
| Nov 15, 2020 19:20 | 2 ppm |
| Nov 8, 2020 18:38 | 2 ppm |
| Nov 1, 2020 17:39 | 2 ppm |
| Oct 18, 2020 17:12 | 10 ppm |
| Oct 11, 2020 17:30 | 10 ppm |
| Oct 5, 2020 18:12 | 25 ppm |
| Sep 30, 2020 10:17 | 25 ppm |