| Date | Value |
|---|---|
| Sep 25, 2016 18:56 | 432 ppm |
| Jun 16, 2016 22:05 | 407 ppm |
| May 13, 2016 19:32 | 451 ppm |
| Mar 15, 2016 21:04 | 459 ppm |
| Mar 8, 2016 19:42 | 438 ppm |
| Feb 22, 2016 19:28 | 509 ppm |
| Feb 16, 2016 20:01 | 407 ppm |
| Feb 6, 2016 20:34 | 424 ppm |
| Jan 31, 2016 20:18 | 409 ppm |
| Jan 30, 2016 20:20 | 537 ppm |
| Jan 29, 2016 20:22 | 478 ppm |
| Jan 28, 2016 20:23 | 423 ppm |
| Nov 13, 2015 17:36 | 463 ppm |
| Nov 12, 2015 16:44 | 439 ppm |
| Nov 8, 2015 20:18 | 333 ppm |