extroversion vs self-obsession

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. 

self-obsession

noun
  • preoccupation with self; egocentrism; selfishness 

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