| 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | |
| C4 groep | 100,00% | 100,00% | 100,00% | 100,00% | 100,00% | 100,00% | 100,00% | 100,00% | 100,00% |
| C4 titels | 73,58% | 80,31% | 80,26% | 80,26% | 79,88% | 80,03% | 79,93% | 79,78% | 79,39% |
| HHI groep | 0,3528 | 0,3542 | 0,3545 | 0,3553 | 0,3566 | 0,359 | 0,5151 | 0,5162 | 0,5164 |
| HHI titels | 0,18 | 0,2106 | 0,2108 | 0,212 | 0,2117 | 0,2121 | 0,2117 | 0,2094 | 0,2069 |