Statistics for 痛いのは嫌なので防御力に極振りしたいと思います。

This graph shows the percentage of words (in total) that you'll be able to read assuming you know a certain percentage of unique vocabulary that appears in this work.

CoverageVocabulary required%
70%9056%
80%157811%
90%316523%
95%523138%
96%596343%
97%691850%
98%824060%
99%1028375%