| Date | Value |
|---|---|
| Mar 12, 2022 16:45 | 500 ppm |
| Feb 19, 2022 15:02 | 550 ppm |
| Jan 8, 2022 10:51 | 700 ppm |
| May 15, 2019 16:43 | 400 ppm |
| Apr 14, 2019 04:53 | 465 ppm |
| Apr 6, 2019 04:51 | 460 ppm |
| Apr 2, 2019 13:38 | 460 ppm |
| Mar 24, 2019 04:51 | 460 ppm |
| Mar 16, 2019 07:03 | 470 ppm |
| Mar 12, 2019 13:20 | 450 ppm |
| Feb 2, 2019 08:33 | 520 ppm |
| Jan 12, 2019 05:47 | 380 ppm |