It's been different since the very start of Wrath, at the very latest, most likely earlier than that (8% for melee single weapon/specials, 17% for spells, 28% for dual wield white hits on bosses, and 7% for specials, 6% for spells, 27% for white hits on level+2 mobs, afaik, numbers may be off for level+2, I know 6% for spells on those 100% because I see that number every day on my lock)
XI Wiki


