| Date | Value |
|---|---|
| Apr 12, 2014 14:45 | 151 ppm |
| Mar 30, 2014 20:36 | 135 ppm |
| Mar 19, 2014 03:18 | 149 ppm |
| Mar 9, 2014 21:59 | 153 ppm |
| Mar 9, 2014 01:46 | 147 ppm |
| Mar 7, 2014 01:19 | 144 ppm |
| Mar 2, 2014 14:52 | 148 ppm |
| Mar 1, 2014 14:27 | 149 ppm |
| Feb 27, 2014 22:53 | 140 ppm |
| Feb 26, 2014 20:16 | 162 ppm |
| Feb 24, 2014 21:31 | 160 ppm |