| Date | Value |
|---|---|
| Mar 10, 2021 00:13 | 1335 ppm |
| Feb 10, 2021 17:25 | 1440 ppm |
| Jan 20, 2021 18:57 | 1410 ppm |
| Dec 28, 2020 17:16 | 1440 ppm |
| Nov 24, 2020 21:01 | 1440 ppm |
| Oct 25, 2020 19:29 | 1425 ppm |
| May 17, 2020 15:44 | 1365 ppm |
| Feb 24, 2020 21:36 | 1410 ppm |
| Feb 16, 2020 23:46 | 1335 ppm |
| Jan 16, 2020 22:24 | 1290 ppm |