Level 5 announced that their titles have shipped a combined total 23.64 million units worldwide.
Dark Cloud (WW) - 1.19m
Dark Chronicle (WW) - 0.89m
Dragon Quest VIII (WW) - 4.90m
Rogue Galaxy (WW) - 0.78m
Jeanne d'Arc (WW) - 0.21m
Professor Layton Series (WW) - 9.18m
Inazuma Eleven Series (JP) - 1.54m
Atamania Series (JP) - 0.44m
White Knight Chronicles (JP) - 0.36m
Dragon Quest IX (JP) - 4.15m
Wow, DQ VIII & IX account for about 40% of that, and Layton another 40%.