| Date | Value |
|---|---|
| Mar 8, 2014 10:20 | 0.00 ppm |
| Feb 8, 2014 12:57 | 0.25 ppm |
| Jan 12, 2014 09:48 | 0.50 ppm |
| Nov 8, 2013 09:18 | 0.00 ppm |
| Oct 12, 2013 14:42 | 0.00 ppm |
| Sep 23, 2013 13:41 | 0.25 ppm |
| Aug 19, 2013 17:48 | 0.00 ppm |
| Aug 8, 2013 10:15 | 0.00 ppm |
| Aug 3, 2013 14:00 | 0.00 ppm |
| Jul 23, 2013 11:05 | 0.00 ppm |
| Jul 22, 2013 18:50 | 0.00 ppm |