| Date | Value |
|---|---|
| Jul 19, 2015 08:44 | 0.00 ppm |
| Apr 26, 2015 11:32 | 0.00 ppm |
| Mar 22, 2015 13:16 | 0.00 ppm |
| Nov 16, 2014 09:18 | 0.00 ppm |
| Sep 15, 2014 13:41 | 0.00 ppm |
| May 24, 2014 15:32 | 0.03 ppm |
| May 11, 2014 15:13 | 0.30 ppm |
| May 11, 2014 15:13 | 0.03 ppm |
| Apr 17, 2014 15:09 | 0.03 ppm |
| Apr 7, 2014 15:16 | 0.25 ppm |
| Apr 4, 2014 13:05 | 0.10 ppm |
| Apr 2, 2014 14:18 | 0.10 ppm |
| Mar 31, 2014 12:04 | 0.03 ppm |