| Date | Value |
|---|---|
| Feb 21, 2021 18:04 | 440 ppm |
| Jan 17, 2021 17:49 | 435 ppm |
| Jan 3, 2021 18:10 | 415 ppm |
| Dec 28, 2020 11:41 | 400 ppm |
| Dec 13, 2020 18:12 | 430 ppm |
| Nov 29, 2020 17:43 | 430 ppm |
| Nov 22, 2020 17:35 | 450 ppm |
| Nov 15, 2020 19:00 | 440 ppm |
| Nov 8, 2020 18:31 | 435 ppm |
| Nov 1, 2020 17:31 | 435 ppm |
| Oct 18, 2020 17:03 | 450 ppm |
| Oct 11, 2020 17:23 | 440 ppm |
| Oct 5, 2020 18:05 | 435 ppm |
| Sep 30, 2020 10:13 | 425 ppm |