expatriation vs relegation

expatriation

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

  • voluntary migration from one's native land to another 

relegation

noun
  • The act of being relegated 

  • Moving from one division to a lower one, due to poor results 

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