Level-5 sales data

Dark Cloud – 1,230,000 World Wide
Dark Cloud 2 – 900,000 World Wide
Dragon Quest VIII – 4,880,000 World Wide
Rogue Galaxy (including Director’s Cut) – 760,000 World Wide
Jeanne d’Arc – 220,000 World Wide
Professor Layton series – 2,650,000 Japan only
Professor Layton and the Curious Village – 1,590,000 (US/EU)
Inazuma Eleven – 342,000 Japan only
White Knight Chronicles – 340,000 Japan only

Source