| Date | Value |
|---|---|
| Jun 4, 2014 18:31 | 20 ppm |
| May 11, 2014 11:18 | 10 ppm |
| May 5, 2014 01:50 | 10 ppm |
| May 4, 2014 06:59 | 10 ppm |
| Apr 24, 2014 15:15 | 10 ppm |
| Apr 22, 2014 07:09 | 10 ppm |
| Apr 21, 2014 12:47 | 10 ppm |
| Apr 15, 2014 03:12 | 5 ppm |
| Apr 13, 2014 07:55 | 5 ppm |
| Mar 29, 2014 12:08 | 5 ppm |
| Mar 23, 2014 07:03 | 5 ppm |
| Mar 21, 2014 11:15 | 5 ppm |
| Mar 15, 2014 08:11 | 5 ppm |
| Mar 2, 2014 08:42 | 5 ppm |