refoulement vs transportation

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. 

transportation

noun
  • Deportation to a penal colony. 

  • A ticket or fare. 

  • A means of conveyance. 

  • The act of transporting, or the state of being transported; conveyance, often of people, goods etc. 

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