boat person vs émigré

boat person

noun
  • A member of any of the ethnic or refugee groups known as "boat people". 

  • Used other than figuratively or idiomatically: see boat, person. 

émigré

noun
  • An emigrant, one who departs their native land to become an immigrant in another, especially a political exile. 

  • A French person who has departed their native land, especially a royalist who left during the French Revolution. 

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