| Date | Value |
|---|---|
| Feb 18, 2014 14:53 | 0.00 ppm |
| Jan 30, 2014 10:16 | 5 ppm |
| Jan 9, 2014 13:59 | 10 ppm |
| Jan 6, 2014 13:59 | 10 ppm |
| Dec 18, 2013 20:10 | 5 ppm |
| Dec 14, 2013 18:28 | 5 ppm |
| Dec 11, 2013 19:39 | 7 ppm |
| Dec 6, 2013 16:14 | 2 ppm |
| Dec 2, 2013 14:28 | 5 ppm |
| Nov 25, 2013 11:49 | 10 ppm |