| Date | Value |
|---|---|
| Dec 28, 2013 21:38 | 450 ppm |
| Dec 4, 2013 19:39 | 500 ppm |
| Dec 4, 2013 19:38 | 500 ppm |
| Dec 4, 2013 19:34 | 500 ppm |
| Dec 4, 2013 19:30 | 1500 ppm |
| Dec 4, 2013 19:29 | 500 ppm |
| Dec 4, 2013 19:27 | 500 ppm |
| Dec 4, 2013 19:19 | 500 ppm |
| Nov 17, 2013 21:49 | 430 ppm |
| Nov 12, 2013 16:46 | 0.00 ppm |
| Nov 12, 2013 16:45 | 0.00 ppm |
| Oct 1, 2013 19:36 | 450 ppm |
| Sep 22, 2013 10:11 | 450 ppm |