| Date | Value |
|---|---|
| Jul 7, 2017 09:07 | 0.00 ppm |
| Jun 26, 2017 15:23 | 0.00 ppm |
| Jun 18, 2017 18:31 | 0.00 ppm |
| Jun 9, 2017 17:25 | 0.00 ppm |
| Jun 1, 2017 19:56 | 0.00 ppm |
| May 29, 2017 23:18 | 0.00 ppm |
| May 28, 2017 20:05 | 2 ppm |
| May 24, 2017 19:19 | 5 ppm |
| May 21, 2017 20:09 | 10 ppm |
| May 18, 2017 22:16 | 5 ppm |
| May 16, 2017 22:49 | 5 ppm |