| Date | Value |
|---|---|
| Jul 1, 2015 20:03 | 0.10 ppm |
| Sep 29, 2014 21:16 | 0.01 ppm |
| Aug 28, 2014 19:09 | 0.00 ppm |
| Jul 11, 2014 20:48 | 0.01 ppm |
| Jun 1, 2014 20:02 | 0.00 ppm |
| May 11, 2014 22:03 | 0.00 ppm |
| May 9, 2014 18:38 | 0.00 ppm |
| May 4, 2014 21:17 | 0.00 ppm |
| May 2, 2014 23:08 | 0.00 ppm |