| Date | Value |
|---|---|
| Mar 3, 2015 21:19 | 435 ppm |
| Feb 22, 2015 00:47 | 450 ppm |
| Feb 20, 2015 21:09 | 430 ppm |
| Oct 17, 2014 00:03 | 470 ppm |
| Aug 17, 2014 20:50 | 450 ppm |
| Aug 12, 2014 00:16 | 440 ppm |
| Aug 5, 2014 20:41 | 440 ppm |
| Aug 2, 2014 22:37 | 435 ppm |
| Jul 31, 2014 21:10 | 430 ppm |
| Jul 29, 2014 23:34 | 440 ppm |
| Jul 25, 2014 00:18 | 450 ppm |
| Jul 21, 2014 23:21 | 425 ppm |
| Jul 20, 2014 21:22 | 460 ppm |
| Jul 16, 2014 21:07 | 480 ppm |
| Jul 14, 2014 21:07 | 440 ppm |