[ストロボ・EdGE]

...

Or maybe it's just the fact that she's been in the industry for over a decade, already puts out an album every year not to mention several compilations, people are tired of seeing her face everywhere, everyone knows she's half deaf, it's over obvious she needs a break for her health, and the voice she once had is completely gone.

You can't be a top seller forever after all.

EDIT: Then there's the fact that female solo artists are "out" and boy bands are "in". Everyone's sales have fallen in any case but Ayu still ranks as a top artist yearly anyway...