| Date | Value |
|---|---|
| Dec 21, 2018 08:36 | 5 ppm |
| Nov 23, 2018 11:06 | 5 ppm |
| Oct 28, 2018 16:59 | 5 ppm |
| Oct 7, 2018 16:16 | 10 ppm |
| Oct 2, 2018 14:20 | 5 ppm |
| Sep 23, 2018 09:38 | 4 ppm |
| Sep 15, 2018 15:08 | 6 ppm |
| Sep 9, 2018 09:28 | 8 ppm |
| Sep 2, 2018 03:59 | 5 ppm |
| Aug 28, 2018 04:30 | 8 ppm |
| Aug 26, 2018 04:52 | 8 ppm |
| Aug 22, 2018 15:00 | 5 ppm |