| Date | Value |
|---|---|
| Jun 29, 2016 08:37 | 1 ppm |
| Jan 23, 2016 03:50 | 0.50 ppm |
| Nov 12, 2015 09:51 | 0.00 ppm |
| Sep 27, 2015 02:38 | 0.70 ppm |
| May 7, 2015 09:19 | 1 ppm |
| Dec 23, 2014 03:23 | 1 ppm |
| Nov 21, 2014 09:25 | 5 ppm |
| Nov 9, 2014 07:40 | 1 ppm |
| Oct 25, 2014 01:42 | 10 ppm |
| Oct 22, 2014 02:38 | 30 ppm |
| Oct 20, 2014 07:07 | 40 ppm |
| Oct 10, 2014 03:09 | 5 ppm |
| Oct 6, 2014 13:06 | 15 ppm |
| Oct 5, 2014 01:57 | 15 ppm |