extroversion vs pleasantness

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. 

pleasantness

noun
  • The state or quality of being pleasant. 

  • Something pleasant. 

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