| Date | Value |
|---|---|
| Aug 13, 2014 20:42 | 1440 ppm |
| Aug 10, 2014 12:26 | 1440 ppm |
| Aug 5, 2014 20:22 | 1410 ppm |
| Jul 23, 2014 22:48 | 1350 ppm |
| Jul 22, 2014 22:03 | 1350 ppm |
| Jul 20, 2014 20:29 | 1230 ppm |
| Jun 12, 2014 10:01 | 1290 ppm |
| Oct 27, 2013 11:21 | 1320 ppm |
| Oct 14, 2013 23:00 | 1440 ppm |
| Oct 11, 2013 13:18 | 1365 ppm |
| Oct 11, 2013 09:53 | 1290 ppm |