| Date | Value |
|---|---|
| Oct 17, 2017 10:02 | 400 ppm |
| Oct 12, 2017 05:23 | 480 ppm |
| Oct 8, 2017 09:24 | 380 ppm |
| Oct 7, 2017 09:20 | 380 ppm |
| Oct 2, 2017 08:10 | 420 ppm |
| Sep 24, 2017 16:03 | 360 ppm |
| Sep 18, 2017 16:27 | 360 ppm |
| Sep 11, 2017 17:11 | 380 ppm |
| Sep 9, 2017 14:56 | 360 ppm |
| Sep 6, 2017 16:10 | 400 ppm |
| Sep 1, 2017 16:09 | 340 ppm |