| Date | Value |
|---|---|
| Aug 7, 2017 19:13 | 0.00 ppm |
| Jul 26, 2017 12:55 | 2 ppm |
| Jul 25, 2017 21:52 | 2 ppm |
| Jul 24, 2017 21:00 | 4 ppm |
| Jul 23, 2017 13:35 | 4 ppm |
| Jul 22, 2017 04:54 | 2 ppm |
| Jul 20, 2017 14:43 | 2 ppm |
| Jul 19, 2017 19:29 | 2 ppm |
| Jul 18, 2017 15:35 | 4 ppm |
| Jul 17, 2017 15:57 | 4 ppm |
| Jul 16, 2017 23:19 | 4 ppm |
| Jul 16, 2017 00:24 | 4 ppm |
| Jul 15, 2017 15:24 | 4 ppm |
| Jul 14, 2017 20:19 | 4 ppm |
| Jul 14, 2017 15:21 | 4 ppm |
| Jul 13, 2017 15:16 | 0.25 ppm |