| Date | Value |
|---|---|
| Mar 4, 2016 15:37 | 0.00 ppm |
| Mar 1, 2016 13:58 | 0.00 ppm |
| Feb 28, 2016 18:40 | 0.10 ppm |
| Feb 25, 2016 13:15 | 0.00 ppm |
| Feb 18, 2016 16:17 | 0.00 ppm |
| Feb 16, 2016 01:25 | 0.00 ppm |
| Feb 15, 2016 10:52 | 0.25 ppm |
| Feb 14, 2016 15:01 | 1 ppm |
| Feb 8, 2016 18:32 | 0.00 ppm |
| Feb 7, 2016 14:50 | 0.15 ppm |
| Feb 1, 2016 11:12 | 0.75 ppm |