extroversion vs niceness

extroversion

noun
  • A personality orientation towards others and things outside oneself; behavior expressing such orientation. 

  • The condition of being inside out, especially in relation to the bladder. 

niceness

noun
  • Pleasantness, especially of behaviour or personality; agreeableness. 

  • A value determining how much processor time to concede to a running process. (See also nice (verb), renice.) 

  • Effeminacy; indulgence in soft living or luxuriousness. 

  • Fastidiousness; fine sensitivity. 

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