| Date | Value |
|---|---|
| Apr 28, 2020 14:36 | 1320 ppm |
| Apr 22, 2020 17:26 | 1280 ppm |
| Apr 20, 2020 12:26 | 1290 ppm |
| Apr 17, 2020 12:18 | 1280 ppm |
| Apr 13, 2020 12:17 | 1340 ppm |
| Apr 9, 2020 19:16 | 1330 ppm |
| Apr 8, 2020 10:45 | 1290 ppm |
| Apr 5, 2020 15:35 | 1280 ppm |
| Apr 2, 2020 19:34 | 1300 ppm |
| Mar 30, 2020 15:11 | 1320 ppm |
| Mar 26, 2020 06:38 | 1290 ppm |
| Mar 22, 2020 14:05 | 1290 ppm |
| Mar 14, 2020 08:52 | 1280 ppm |
| Feb 28, 2020 14:19 | 1270 ppm |