Here's my breakdown:
Con, Dex, and Wis saves correlate pretty strongly to where Fortitude, Reflex, and Will saves were in 3.x and 4e, making them the most common saves.

Strength saves seem to be the next most common, usually to resist forced movement. Intelligence saves are almost exclusively the domain of aberrations, with the Mind Flayer and Intellect Devourer using them to terrible effect. I don't recall any Charisma saves off hand.

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