| Date | Value |
|---|---|
| Sep 14, 2015 17:45 | 1140 ppm |
| Apr 28, 2015 14:28 | 1365 ppm |
| Apr 12, 2015 22:17 | 1275 ppm |
| Jan 26, 2015 21:44 | 1305 ppm |
| Jan 7, 2015 21:41 | 1340 ppm |
| Jan 5, 2015 11:21 | 1140 ppm |
| Oct 24, 2014 16:51 | 1170 ppm |
| Sep 2, 2014 17:41 | 1125 ppm |
| Sep 1, 2014 17:05 | 1050 ppm |
| Aug 22, 2014 18:52 | 1170 ppm |
| Aug 8, 2014 14:44 | 1215 ppm |
| Jul 30, 2014 22:35 | 1230 ppm |