| Date | Value |
|---|---|
| May 14, 2013 18:44 | 1260 ppm |
| May 6, 2013 15:13 | 1320 ppm |
| Apr 28, 2013 18:31 | 1290 ppm |
| Apr 21, 2013 18:31 | 1260 ppm |
| Apr 18, 2013 18:31 | 1260 ppm |
| Mar 7, 2013 18:31 | 1260 ppm |
| Mar 3, 2013 18:31 | 1290 ppm |
| Feb 26, 2013 18:31 | 1200 ppm |
| Feb 10, 2013 18:31 | 1290 ppm |
| Feb 3, 2013 18:31 | 1290 ppm |
| Jan 23, 2013 18:31 | 1290 ppm |
| Jan 11, 2013 18:31 | 1290 ppm |
| Jan 3, 2013 18:31 | 1200 ppm |