| Date | Value |
|---|---|
| Sep 10, 2015 16:10 | 420 ppm |
| Aug 28, 2015 22:55 | 370 ppm |
| Aug 23, 2015 23:03 | 420 ppm |
| Aug 22, 2015 23:08 | 420 ppm |
| Aug 19, 2015 23:45 | 430 ppm |
| Aug 17, 2015 23:56 | 420 ppm |
| Aug 13, 2015 19:23 | 410 ppm |
| Aug 11, 2015 14:27 | 410 ppm |
| Aug 7, 2015 23:47 | 400 ppm |
| Aug 5, 2015 00:50 | 390 ppm |