| December 2011 | 100.00% |
| November 2011 | 100.00% |
| October 2011 | 100.00% |
| September 2011 | 100.00% |
| August 2011 | 100.00% |
| July 2011 | 100.00% |
| June 2011 | 100.00% |
| May 2011 | 100.00% |
| April 2011 | 100.00% |
| March 2011 | 100.00% |
| February 2011 | 100.00% |
| January 2011 | 99.96% |
| December 2010 | 100.00% |
| November 2010 | 99.93% |
| October 2010 | 100.00% |