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"The rarity of each type of trophy, on a scale of 1 to 4, depends on how many players have earned that trophy. The fewer the players who have earned the trophy, the rarer the trophy is, from common to rare, very rare, and ultra rare."
https://manuals.playstation.net › pstv
About trophies | PlayStation®TV User's Guide

This is from Sony themselves. Shared to clear up any misconceptions on what it,as far as I see,is obviously what the percentage means.