exile vs expatriation

exile

noun
  • The state of being banished from one's home or country. 

  • Someone who is banished from their home or country. 

verb
  • To send (someone or something) into exile. 

expatriation

noun
  • forced expulsion of from one's native land to another 

  • voluntary migration from one's native land to another 

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