recochoku celebrates 15 years and for this they put a ranking of the best selling artists and songs of these 15 years together.
Ayu is at #3.
http://recochoku.jp/special/100529/?...ate=4299010125
Top 10 artists:
1. EXILE
2. Koda Kumi
3. Ayumi Hamasaki
4. ORANGE RANGE
5. Kobukoro
6. Ai Otsuka
7. GReeeeN
8. Hikaru Utada
9. Kana Nishino
10. Mika Nakashima
For songs HEAVEN charts at #49.