| Date | Value |
|---|---|
| May 3, 2022 18:11 | 1280 ppm |
| Feb 21, 2022 07:33 | 1500 ppm |
| Nov 28, 2021 22:03 | 1380 ppm |
| Nov 8, 2021 01:48 | 1350 ppm |
| Oct 12, 2021 23:29 | 1370 ppm |
| May 10, 2021 18:02 | 1350 ppm |
| Mar 3, 2021 01:06 | 1250 ppm |
| Jan 19, 2021 02:18 | 1270 ppm |
| Dec 1, 2020 21:22 | 1230 ppm |
| Sep 1, 2020 18:14 | 1280 ppm |