| Date | Value |
|---|---|
| Feb 6, 2017 07:20 | 7 ppm |
| Feb 1, 2017 14:10 | 8 ppm |
| Jan 26, 2017 19:51 | 9 ppm |
| Jan 26, 2017 10:36 | 9 ppm |
| Jan 23, 2017 10:36 | 7 ppm |
| Jan 16, 2017 10:22 | 9 ppm |
| Jan 11, 2017 10:15 | 8 ppm |
| Jan 10, 2017 10:12 | 9 ppm |
| Jan 6, 2017 10:04 | 10 ppm |
| Jan 1, 2017 10:00 | 8 ppm |