extroversion vs forthcomingness

extroversion

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

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

forthcomingness

noun
  • The state or quality of being forthcoming. 

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