| Date | Value |
|---|---|
| Jul 8, 2012 04:31 | 10 ppm |
| Jun 29, 2012 07:30 | 15 ppm |
| Jun 22, 2012 09:46 | 40 ppm |
| Jun 22, 2012 09:46 | 20 ppm |
| Jun 17, 2012 06:04 | 20 ppm |
| Jun 16, 2012 19:54 | 20 ppm |
| Jun 15, 2012 10:24 | 5 ppm |
| Apr 28, 2012 04:13 | 10 ppm |
| Apr 27, 2012 11:43 | 20 ppm |
| Apr 21, 2012 23:42 | 20 ppm |
| Apr 20, 2012 07:09 | 20 ppm |
| Apr 17, 2012 20:08 | 10 ppm |