| Date | Value |
|---|---|
| Jan 28, 2022 11:06 | 1200 ppm |
| Aug 18, 2020 09:43 | 1480 ppm |
| May 10, 2020 17:09 | 1300 ppm |
| Jan 19, 2020 09:31 | 1360 ppm |
| Jan 4, 2020 16:45 | 1320 ppm |
| Dec 29, 2019 13:43 | 1400 ppm |
| Dec 22, 2019 13:09 | 1300 ppm |
| Dec 15, 2019 20:28 | 1280 ppm |
| Dec 3, 2019 11:21 | 1280 ppm |