Given how downloads seem to be rather low overall, I would think top 5 at the least. MAYBE top 3?
Also I finally saw what mimika was talking about with Max's tweets earlier in the year! He basically held a camp for songwriters/producers to make stuff for Ayu, lol.
http://ahsforum.com/forum/showthread.php?t=124947
Pretty much covered it in this thread. It bodes well for more Ayu music down the road. It seems Asia is a big target from now on along with general global appeal?