About 80% - currently, my games tend to be quite combat-focused due to player preference, but I try to throw in at least one non-combat challenge (puzzle, trap, interaction, or other skill use) per session.
I also try to tailor the challenges to the PCs, so if someone is playing a character with trapfinding, there will be more traps, and if someone is playing an interaction-focused character, there will be more interaction-based challenges, etc.