| Date | Value |
|---|---|
| Sep 2, 2017 12:29 | 0.00 ppm |
| Apr 22, 2017 18:19 | 0.00 ppm |
| Apr 13, 2017 08:01 | 0.00 ppm |
| Mar 12, 2017 10:24 | 0.00 ppm |
| Mar 9, 2017 18:04 | 0.00 ppm |
| Mar 9, 2017 11:33 | 0.25 ppm |
| Mar 4, 2017 12:10 | 0.00 ppm |
| Feb 20, 2017 21:47 | 0.00 ppm |
| Feb 19, 2017 08:31 | 0.00 ppm |
| Feb 15, 2017 00:21 | 0.00 ppm |
| Feb 13, 2017 21:43 | 0.00 ppm |
| Feb 11, 2017 18:25 | 0.25 ppm |