| Date | Value |
|---|---|
| Jun 26, 2016 08:22 | 404 ppm |
| May 28, 2016 19:55 | 404 ppm |
| May 23, 2016 07:59 | 410 ppm |
| May 15, 2016 09:27 | 404 ppm |
| May 8, 2016 09:31 | 398 ppm |
| May 3, 2016 07:52 | 410 ppm |
| Apr 21, 2016 11:24 | 416 ppm |
| Apr 20, 2016 12:32 | 398 ppm |
| Apr 19, 2016 14:08 | 380 ppm |
| Apr 18, 2016 08:53 | 356 ppm |
| Apr 17, 2016 13:36 | 290 ppm |
| Apr 13, 2016 08:42 | 350 ppm |
| Apr 10, 2016 15:52 | 356 ppm |