| Date | Value |
|---|---|
| May 21, 2019 02:35 | 0.00 ppm |
| May 14, 2019 02:35 | 0.00 ppm |
| May 12, 2019 19:16 | 0.00 ppm |
| May 7, 2019 03:05 | 0.00 ppm |
| Apr 22, 2019 12:29 | 0.00 ppm |
| Mar 30, 2019 18:00 | 5 ppm |
| Mar 6, 2019 23:00 | 0.00 ppm |
| Mar 2, 2019 14:40 | 0.00 ppm |
| Feb 26, 2019 21:42 | 0.00 ppm |