Nintendo says 20m. Have they set the bar too high in recent years? Most recent one I remember is 3DS' first or second fiscal year.
Anyway, I'm guessing 23, since they usually lowball it. They have to have an Animal Crossing, Fire Emblem and Metroid or just a Pokemon to get those numbers.
"You should be banned. Youre clearly flaming the president and even his brother who you know nothing about. Dont be such a partisan hack"