Well, I've made reference to this list once or twice, now I'll give you the complete details. This is a list, originally compiled by Oricon and reported on Countdown TV, of the Top Ten selling J-Pop artists of the 1990's, as determined by unit sales (CD albums and Singles each counting as 1 unit). Sales earnings are also listed.

ARTIST
UNIT SALES
SALES EARNINGS
10. Oguro Maki
21,133,380
¥ 40,577,200,000
9. TRF
21,343,900
¥ 39,310,800,000
8. Amuro Namie
21,454,900
¥ 40,446,300,000
7. Southern All-Stars
21,861,680
¥ 48,014,000,000
6. Globe
22,254,440
¥ 42,929,700,000
5. Chage & Aska
26,314,410
¥ 54,255,800,000
4. Zard
27,349,450
¥ 49,547,500,000
3. Mr. Children
30,131,500
¥ 53,057,900,000
2. Dreams Come True
32,680,250
¥ 69,092,100,000
1. B'z
55,868,540
¥ 114,031,700,000

Source: Countdown TV 8-Year Anniversary Special, 00.01.03