| Date | Value |
|---|---|
| Oct 25, 2013 12:26 | 0.01 ppm |
| Sep 8, 2013 16:36 | 0.00 ppm |
| May 9, 2013 23:59 | 0.00 ppm |
| Apr 3, 2013 12:40 | 0.00 ppm |
| Feb 2, 2013 12:46 | 0.00 ppm |
| Dec 30, 2012 13:10 | 0.00 ppm |
| Nov 11, 2012 13:16 | 0.00 ppm |
| Nov 8, 2012 13:25 | 0.00 ppm |
| Oct 10, 2012 13:28 | 0.00 ppm |
| Oct 10, 2012 13:28 | 2 ppm |
| Oct 10, 2012 13:28 | 0.00 ppm |
| Sep 22, 2012 13:28 | 0.00 ppm |