Blu-rays sale percentage tracking

[ssj12]

Kyros said:

*DVD sales down 5.21% to $115.29m
*Blu-ray sales up 7.12% to $8.42m
*DVD 88%/Blu-ray 12%

Do not understand it. BR has 12% of disc sales but only 7% (8.5 / 115+8.5)  of  revenue? A BluRay disc costs much more than a DVD so how can this be true?

 

the graphs are top 20 vs top 20