| Date | Value |
|---|---|
| Apr 1, 2021 17:52 | 30 ppm |
| Mar 14, 2021 01:00 | 40 ppm |
| Mar 6, 2021 17:12 | 2.5 ppm |
| Feb 27, 2021 00:54 | 0.00 ppm |
| Feb 18, 2021 00:46 | 80 ppm |
| Feb 7, 2021 03:01 | 30 ppm |
| Jan 29, 2021 22:15 | 1 ppm |
| Jan 23, 2021 04:36 | 20 ppm |
| Jan 22, 2021 18:58 | 40 ppm |
| Jan 19, 2021 18:53 | 20 ppm |
| Jan 17, 2021 06:03 | 30 ppm |
| Jan 15, 2021 23:06 | 20 ppm |
| Jan 9, 2021 00:11 | 20 ppm |
| Jan 5, 2021 18:18 | 30 ppm |