^ Nah, Ayu passed 50 million last year.
I know this is wikipedia but it's also math so I guess I won't challenge it and go get out a calculator myself:
http://en.wikipedia.org/wiki/Ayumi_H..._Sales_Only.29
Also, dropping to 9th after new releases come out is not bad at all. For one thing, it's guaranteed that Ayu will probably be in top 5 again by the end of the week from climbing since other singles drop further than Ayu. Looking at the competition this week, I'm quite certain too.