| Date | Value |
|---|---|
| Nov 30, 2016 01:01 | 0.00 ppm |
| Oct 1, 2015 12:52 | 0.00 ppm |
| Sep 29, 2015 00:02 | 0.20 ppm |
| Sep 26, 2015 15:02 | 0.20 ppm |
| Sep 24, 2015 15:08 | 0.00 ppm |
| Sep 22, 2015 00:06 | 0.20 ppm |
| Sep 17, 2015 15:41 | 0.40 ppm |
| Sep 15, 2015 20:18 | 1 ppm |
| Sep 12, 2015 08:44 | 1.2 ppm |
| Sep 9, 2015 14:44 | 2 ppm |