mini- vs under-

mini-

prefix

  • With the hemline well above the knee. 

  • Smaller version of an item than usual. 

under-

prefix

  • Beneath, under 

  • Behind 

  • Subordinate to 

  • Deficient, below what is correct 

How often have the words mini- and under- occurred in a corpus of books? (source: Google Ngram Viewer )