| Date | Value |
|---|---|
| Oct 3, 2013 18:40 | 0.12 ppm |
| Sep 23, 2013 13:26 | 0.00 ppm |
| Sep 19, 2013 17:31 | 0.00 ppm |
| Sep 19, 2013 17:31 | 0.00 ppm |
| Aug 29, 2013 19:41 | 0.00 ppm |
| Aug 29, 2013 19:41 | 0.00 ppm |
| Jul 11, 2013 18:20 | 0.00 ppm |
| Apr 1, 2013 15:11 | 0.10 ppm |
| Mar 25, 2013 10:38 | 0.00 ppm |
| Mar 11, 2013 17:43 | 0.00 ppm |
| Mar 4, 2013 16:54 | 0.00 ppm |
| Feb 25, 2013 10:24 | 0.00 ppm |
| Feb 19, 2013 10:54 | 0.00 ppm |