| Date | Value |
|---|---|
| Oct 8, 2015 00:09 | 10 ppm |
| May 19, 2015 06:35 | 10 ppm |
| May 4, 2015 07:30 | 40 ppm |
| Apr 17, 2015 21:22 | 10 ppm |
| Apr 1, 2015 02:50 | 5 ppm |
| Mar 29, 2015 01:52 | 60 ppm |
| Mar 20, 2015 23:48 | 60 ppm |
| Mar 16, 2015 02:12 | 5 ppm |
| Jan 28, 2015 19:08 | 5 ppm |
| Jan 5, 2015 01:42 | 5 ppm |
| Jan 2, 2015 21:19 | 20 ppm |
| Dec 28, 2014 19:12 | 3 ppm |