I can give you also a best selling by year in Yen (Rounded numbers):
1997: GLAY (176,300,000 Yen)
1998: B'z (354,900,000 Yen)
1999: Utada Hikaru (281,200,000 Yen)
2000: hamasaki ayumi (217,500,000 Yen)
2001: hamasaki ayumi (243,700,000 Yen)
2002: Utada Hikaru (133,400,000 Yen)
2003: hamasaki ayumi (105,200,000 Yen)
2004: Utada Hikaru (86,600,000 Yen)
2005: Orange Range (143,500,000 Yen)
2006: koda kumi (127,000,000 Yen)
2007: koda kumi (73,500,000 Yen)
2008: EXILE (195,800,000 Yen)
2009: ARASHI (144,600,000 Yen)
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