| | Method | | | Neg. Exp. |
| | April 2012 | 0,83% | 1,32% | 0,91% | | May 2012 | 4,23% | 5,34% | 4,85% | | June 2012 | 2,77% | 3,92% | 3,72% | | July 2012 | 1,27% | 1,04% | 1,38% | | August 2012 | 3,99% | 2,74% | 3,36% | | September 2012 | 1,25% | 1,48% | 1,47% | | October 2012 | 4,7% | 5,96% | 5,42% | | November 2012 | 2,03% | 2,98% | 2,76% | | December 2012 | 3,35% | 2,32% | 2,71% | | January 2013 | 1,58% | 0,96% | 1,30% | | February 2013 | 2,9% | 1,78% | 2,72% | | March 2013 | 7,28% | 5,95% | 6,47% |
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