| Date | Value |
|---|---|
| Jul 4, 2017 16:52 | 0.03 ppm |
| May 24, 2017 20:36 | 0.15 ppm |
| Feb 28, 2017 23:23 | 0.00 ppm |
| Feb 7, 2017 20:10 | 0.00 ppm |
| Feb 3, 2017 10:00 | 0.00 ppm |
| Jan 15, 2017 21:09 | 0.00 ppm |
| Mar 6, 2016 13:07 | 0.00 ppm |
| Jan 8, 2016 10:19 | 0.00 ppm |
| Jan 5, 2016 11:49 | 0.00 ppm |
| Dec 23, 2015 12:21 | 0.00 ppm |
| Dec 15, 2015 09:49 | 0.00 ppm |
| Dec 1, 2015 15:31 | 0.00 ppm |