2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | |
C4 | 87% | 85% | 91% | 90% | 89% | 89% | 89% | 88% | 90% | 89% | 91% |
C2 | 87% | 85% | 89% | 86% | 83% | 83% | 81% | 83% | 84% | 83% | 85% |
HHI | 0,475946 | 0,453344 | 0,502154 | 0,466194 | 0,442114 | 0,43427974 | 0,423194 | 0,44149204 | 0,45028692 | 0,42343286 | 0,50281483 |