| Date | Value |
|---|---|
| Nov 21, 2016 16:19 | 0.00 ppm |
| Jun 3, 2016 16:53 | 0.00 ppm |
| Apr 1, 2015 14:21 | 0.10 ppm |
| Mar 28, 2015 12:08 | 1 ppm |
| Mar 26, 2015 14:33 | 1 ppm |
| Mar 22, 2015 14:20 | 1 ppm |
| Mar 19, 2015 14:40 | 2 ppm |
| Mar 16, 2015 12:28 | 1 ppm |
| Mar 14, 2015 07:14 | 0.50 ppm |
| Mar 10, 2015 15:17 | 0.50 ppm |
| Mar 8, 2015 14:15 | 0.50 ppm |
| Mar 6, 2015 13:38 | 0.20 ppm |
| Mar 4, 2015 13:36 | 0.20 ppm |
| Mar 3, 2015 14:26 | 0.10 ppm |
| Mar 2, 2015 12:28 | 0.10 ppm |