| Date | Value |
|---|---|
| Dec 19, 2014 07:00 | 1 ppm |
| May 29, 2014 22:14 | 1 ppm |
| Apr 13, 2014 19:27 | 1 ppm |
| Mar 11, 2014 22:35 | 2.5 ppm |
| Feb 3, 2014 20:33 | 2.5 ppm |
| Dec 27, 2013 13:01 | 1 ppm |
| Dec 10, 2013 13:01 | 2.5 ppm |
| Nov 17, 2013 13:01 | 7.5 ppm |
| Nov 12, 2013 13:01 | 2.5 ppm |
| Nov 10, 2013 13:01 | 0.00 ppm |
| Nov 8, 2013 13:01 | 2.5 ppm |