| Date | Value |
|---|---|
| Mar 3, 2015 21:34 | 1400 ppm |
| Feb 22, 2015 00:44 | 1460 ppm |
| Oct 17, 2014 00:09 | 1460 ppm |
| Aug 17, 2014 20:42 | 1380 ppm |
| Jul 31, 2014 21:23 | 1300 ppm |
| Jul 21, 2014 23:29 | 1400 ppm |
| Jul 20, 2014 21:31 | 1400 ppm |
| Jul 16, 2014 20:57 | 1400 ppm |
| Jul 14, 2014 21:33 | 1110 ppm |