| Date | Value |
|---|---|
| Oct 13, 2014 20:26 | 0.25 ppm |
| Mar 22, 2014 12:21 | 0.00 ppm |
| Mar 10, 2014 15:49 | 0.00 ppm |
| Feb 19, 2014 20:50 | 0.00 ppm |
| Jan 22, 2014 19:59 | 0.25 ppm |
| Jan 15, 2014 20:44 | 0.35 ppm |
| Dec 30, 2013 20:32 | 0.50 ppm |
| Dec 7, 2013 18:27 | 0.00 ppm |
| Nov 26, 2013 21:54 | 0.25 ppm |
| Nov 13, 2013 17:50 | 0.00 ppm |
| Nov 8, 2013 19:11 | 0.00 ppm |