| Date | Value |
|---|---|
| Dec 28, 2021 20:34 | 1410 ppm |
| Nov 28, 2021 22:02 | 1350 ppm |
| Apr 11, 2021 15:55 | 1350 ppm |
| Dec 1, 2020 21:23 | 1130 ppm |
| Aug 10, 2020 00:18 | 1230 ppm |
| Mar 5, 2020 21:54 | 1320 ppm |
| Oct 27, 2019 19:18 | 1420 ppm |
| Oct 17, 2019 22:57 | 1410 ppm |
| May 30, 2019 04:40 | 1450 ppm |