refoulement vs repatriation

refoulement

noun
  • Rendition of a person to an area (chiefly their country of origin) where they will face mistreatment, for example, expulsion of refugees into a war zone; (countable) an instance of this. 

repatriation

noun
  • The process of returning of a person to their country of origin or citizenship. 

  • The process of returning artworks, museum exhibits, etc. to their country of origin. 

  • The process of converting a foreign currency into the currency of one's own country. 

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