| Date | Value |
|---|---|
| Mar 2, 2015 11:38 | 0.55 ppm |
| May 26, 2014 05:00 | 0.00 ppm |
| May 21, 2014 12:41 | 0.00 ppm |
| May 17, 2014 08:25 | 0.00 ppm |
| May 6, 2014 07:50 | 0.00 ppm |
| Apr 26, 2014 13:13 | 0.00 ppm |
| Apr 19, 2014 13:26 | 0.05 ppm |
| Apr 7, 2014 12:33 | 0.00 ppm |
| Apr 4, 2014 11:41 | 0.00 ppm |
| Apr 2, 2014 14:23 | 0.00 ppm |
| Mar 27, 2014 15:36 | 0.00 ppm |
| Mar 8, 2014 11:41 | 0.00 ppm |