| Date | Value |
|---|---|
| Apr 25, 2015 09:39 | 1250 ppm |
| May 12, 2014 21:01 | 1250 ppm |
| Apr 7, 2014 20:57 | 1325 ppm |
| Mar 6, 2014 11:01 | 1300 ppm |
| Feb 24, 2014 20:18 | 1250 ppm |
| Feb 3, 2014 20:40 | 1250 ppm |
| Dec 25, 2013 13:41 | 1350 ppm |
| Dec 23, 2013 13:41 | 1200 ppm |
| Dec 21, 2013 13:41 | 1225 ppm |
| Dec 20, 2013 13:41 | 1125 ppm |
| Dec 19, 2013 13:41 | 1100 ppm |
| Dec 16, 2013 13:41 | 1000 ppm |
| Dec 12, 2013 13:41 | 1000 ppm |