| Date | Value |
|---|---|
| Mar 8, 2014 10:20 | 40 ppm |
| Feb 8, 2014 12:51 | 30 ppm |
| Nov 8, 2013 09:18 | 40 ppm |
| Oct 20, 2013 10:54 | 20 ppm |
| Oct 12, 2013 13:38 | 80 ppm |
| Sep 23, 2013 13:48 | 80 ppm |
| Aug 19, 2013 17:48 | 20 ppm |
| Aug 8, 2013 10:14 | 20 ppm |
| Aug 6, 2013 17:33 | 20 ppm |
| Aug 3, 2013 13:59 | 10 ppm |
| Jul 29, 2013 21:45 | 10 ppm |
| Jul 23, 2013 11:05 | 20 ppm |
| Jul 22, 2013 18:50 | 40 ppm |