| Date | Value |
|---|---|
| Jul 7, 2017 10:54 | 1275 ppm |
| Apr 26, 2017 21:40 | 1395 ppm |
| Apr 12, 2017 22:03 | 1410 ppm |
| Apr 8, 2017 14:13 | 1410 ppm |
| Apr 6, 2017 19:59 | 1440 ppm |
| Apr 4, 2017 18:56 | 1425 ppm |
| Apr 3, 2017 17:18 | 1335 ppm |
| Mar 30, 2017 18:37 | 1260 ppm |
| Mar 27, 2017 18:19 | 1440 ppm |
| Mar 24, 2017 18:33 | 1335 ppm |
| Mar 23, 2017 19:54 | 1110 ppm |