WCAG compliance Levels dependent on lower levels.

Currently each level of WCAG compliance (A, AA, and AAA) is independent so that a report can appear to have a rating for level A at 25% and level AA at 90%. My request is to make each level dependent on the level before it so a higher level AA percentage cannot be higher than the level A percentage. In the previous example the level A is 25% and the level AA would be 22.9%, 90% of 25.