| Date | Value |
|---|---|
| Jan 16, 2015 21:24 | 360 ppm |
| Nov 23, 2014 03:39 | 420 ppm |
| Nov 20, 2014 20:30 | 420 ppm |
| Nov 11, 2014 21:15 | 500 ppm |
| Sep 29, 2014 09:54 | 430 ppm |
| Sep 14, 2014 10:04 | 460 ppm |
| Sep 13, 2014 11:17 | 470 ppm |
| Sep 12, 2014 11:15 | 465 ppm |
| Sep 10, 2014 11:21 | 470 ppm |
| Sep 3, 2014 11:07 | 470 ppm |
| Aug 30, 2014 11:07 | 470 ppm |
| Aug 28, 2014 09:23 | 470 ppm |
| Aug 27, 2014 09:23 | 485 ppm |
| Aug 26, 2014 09:23 | 425 ppm |
| Sep 20, 2012 22:09 | 420 ppm |