| Date | Value |
|---|---|
| Mar 17, 2013 14:24 | 0.00 ppm |
| Mar 11, 2013 14:20 | 0.00 ppm |
| Feb 16, 2013 21:00 | 0.00 ppm |
| Feb 3, 2013 21:06 | 0.00 ppm |
| Jan 28, 2013 21:10 | 0.00 ppm |
| Jan 22, 2013 22:27 | 0.00 ppm |
| Jan 16, 2013 22:31 | 0.00 ppm |
| Jan 7, 2013 22:35 | 5 ppm |
| Jan 1, 2013 22:35 | 0.00 ppm |