That's how her album ranks in the 100 best-selling albums in Japanese history.
A Song for XX: not on the list
Loveppears: 36th best-selling album in Japan [2,562,120]
Duty: 22th best-selling album in Japan [2,904,420]
A Best: 6th best-selling album in Japan [4,281,620]
I Am...: 49th best-selling album in Japan [2,301,020]
Rainbow: 83th best-selling album in Japan [1,857,000]
A Ballads: not on the list
Memorial Address: not on the list
My Story: not on the list
Also, Ayu was never number 1 on the yearly ranking. In 2001 she was 2, first being Hikki. In 2000 she was 2, first being Mai Kuraki. In 2002 she was 2, first being Hikki again. And in 2003 she was 2, first being Chemistry.
Ayu is usually compared to her, so I think it's fair to put her sales too. BUT DON'T START FIGHTS or debates on why Hikki is better positioned:
Hikki sales:
First Love: Best-selling album in Japan
Distance: 4th on the list
Deep River: 8th on the list
Utada Hikaru Single Collection: 50th on the list (just 200k copies behind I Am...)
And also, Namie Amuro sales:
Sweet 19 Blues: 12th best-selling album in Japan
Concentration 20: 78th best-selling album in Japan
181920: 99th best-selling album in Japan
NOTES:
1. Japan is the second biggest music marketing in the world, to be in the TOP 100, doesn't matter in what position, is already a big achievement.
2. All albums after 30th position can go down, because the list don't have 2005 sales and artists like Orange Range (with MusiQ) will be in the Top 30 once the list is updated.
3. Please, no fights on who's better or who's more popular or why Hikki sells more. I tought it was important to put her because she's always compared to Ayu and I didn't want to start another topic with her positions. If you want to express your opinion on this, feel free, but don't go to far, because there are LOTS of other topics for you to do that.
Link for the complete list:
www.ongakuen.com/album.htm