fatherland vs metropole

fatherland

noun
  • The country of one's ancestors. 

  • The country of one's birth, origin. 

metropole

noun
  • The parent-state of a colony. 

  • A metropolis; the main city of a country or area. 

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