| Date | Value |
|---|---|
| Mar 21, 2016 03:15 | 0.00 ppm |
| Mar 14, 2016 00:58 | 0.00 ppm |
| Mar 7, 2016 02:03 | 0.50 ppm |
| Feb 7, 2016 19:43 | 0.00 ppm |
| Jan 3, 2016 20:48 | 0.00 ppm |
| Nov 30, 2015 00:57 | 0.00 ppm |
| Nov 14, 2015 01:04 | 0.00 ppm |
| Oct 6, 2015 20:14 | 0.00 ppm |
| Aug 31, 2015 21:32 | 0.00 ppm |
| Aug 28, 2015 02:03 | 0.00 ppm |
| Aug 27, 2015 01:24 | 2 ppm |
| Aug 23, 2015 19:35 | 0.50 ppm |
| Aug 23, 2015 01:52 | 0.25 ppm |