| Date | Value |
|---|---|
| Feb 19, 2021 21:04 | 1380 ppm |
| Jan 20, 2021 01:05 | 1380 ppm |
| Jan 13, 2021 22:28 | 1350 ppm |
| Jan 9, 2021 15:16 | 1380 ppm |
| Jan 3, 2021 15:24 | 1380 ppm |
| Dec 29, 2020 19:40 | 1350 ppm |
| Dec 19, 2020 14:32 | 1320 ppm |
| Dec 12, 2020 15:15 | 1380 ppm |
| Dec 7, 2020 23:52 | 1380 ppm |
| Nov 2, 2020 10:50 | 1280 ppm |