| Date | Value |
|---|---|
| Feb 21, 2021 17:55 | 1320 ppm |
| Jan 17, 2021 18:03 | 1290 ppm |
| Jan 3, 2021 18:03 | 1320 ppm |
| Dec 28, 2020 11:45 | 1290 ppm |
| Dec 13, 2020 18:19 | 1320 ppm |
| Nov 29, 2020 17:51 | 1350 ppm |
| Nov 22, 2020 17:27 | 1380 ppm |
| Nov 15, 2020 17:20 | 1340 ppm |
| Nov 8, 2020 18:38 | 1350 ppm |
| Nov 1, 2020 17:39 | 1310 ppm |
| Oct 18, 2020 17:10 | 1310 ppm |
| Oct 11, 2020 17:30 | 1350 ppm |
| Oct 5, 2020 18:08 | 1380 ppm |
| Sep 30, 2020 10:17 | 1360 ppm |