| Date | Value |
|---|---|
| Jul 21, 2013 17:48 | 0.00 ppm |
| Mar 19, 2013 20:03 | 0.00 ppm |
| Mar 6, 2013 23:00 | 0.00 ppm |
| Mar 2, 2013 00:01 | 0.00 ppm |
| Feb 28, 2013 23:14 | 0.00 ppm |
| Feb 24, 2013 23:22 | 0.00 ppm |
| Feb 23, 2013 00:38 | 0.00 ppm |
| Feb 20, 2013 00:38 | 0.25 ppm |
| Feb 13, 2013 00:38 | 0.00 ppm |
| Feb 9, 2013 00:38 | 0.00 ppm |
| Feb 3, 2013 00:38 | 0.25 ppm |
| Jan 30, 2013 00:38 | 0.50 ppm |
| Jan 20, 2013 00:38 | 0.50 ppm |