| Date | Value |
|---|---|
| Jun 8, 2013 19:26 | 0.00 ppm |
| May 26, 2013 23:25 | 0.00 ppm |
| May 10, 2013 11:31 | 5 ppm |
| May 5, 2013 20:29 | 7.5 ppm |
| Apr 27, 2013 11:34 | 10 ppm |
| Apr 22, 2013 11:21 | 10 ppm |
| Apr 12, 2013 20:27 | 15 ppm |
| Apr 5, 2013 09:19 | 10 ppm |
| Mar 29, 2013 11:27 | 10 ppm |
| Mar 22, 2013 08:40 | 10 ppm |
| Mar 19, 2013 09:29 | 10 ppm |
| Mar 17, 2013 23:37 | 10 ppm |
| Mar 16, 2013 11:14 | 15 ppm |
| Mar 7, 2013 10:19 | 10 ppm |