| Date | Value |
|---|---|
| Mar 10, 2019 12:36 | 1740 ppm |
| Jan 28, 2019 13:00 | 2 ppm |
| Jan 28, 2019 12:34 | 1280 ppm |
| Nov 17, 2018 12:25 | 1600 ppm |
| Nov 13, 2018 13:20 | 1620 ppm |
| Nov 12, 2018 17:29 | 1660 ppm |
| Oct 25, 2018 13:27 | 1480 ppm |
| Sep 23, 2018 17:27 | 1360 ppm |
| Sep 10, 2018 02:48 | 1250 ppm |