| Month | 1 | 2 | 3 | 4 | 5 |
| April 2012 | 0,47% | 0,58% | 0,51% | 0,52% | 0,54% | May 2012 | 0,52% | 0,66% | 0,75% | 0,79% | 0,73% | June 2012 | 0,67% | 0,75% | 0,77% | 1,01% | 1,15% | July 2012 | 0,51% | 0,61% | 0,80% | 0,92% | 1,19% | August 2012 | 0,63% | 0,85% | 0,98% | 1,10% | 1,17% | September 2012 | 0,52% | 0,50% | 0,46% | 0,51% | 0,45% | October 2012 | 0,28% | 0,38% | 0,55% | 0,75% | 0,85% | November 2012 | 0,64% | 0,67% | 0,75% | 0,86% | 0,96% | December 2012 | 0,51% | 0,69% | 0,71% | 0,78% | 0,90% | January 2013 | 0,41% | 0,45% | 0,55% | 0,59% | 0,58% | February 2013 | 0,70% | 0,84% | 1,04% | 1,23% | 1,41% | March 2013 | 0,61% | 0,91% | 1,21% | 1,39% | 1,74% |
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