egoism vs egomania

egoism

noun
  • Egotism (tendency to talk excessively about oneself). 

  • The tendency to think selfishly with exclusive self-interest in mind. 

  • The belief that moral behavior should be directed toward one's self-interest only. 

egomania

noun
  • Excessive vanity, pride or arrogance; self-importance. 

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