Britfag vs Englishman

Britfag

noun
  • A person from the United Kingdom. 

Englishman

noun
  • A native or inhabitant of England; a man who is English by ancestry, birth, descent, or naturalisation. 

  • The grey partridge (in opposition to the Frenchman, i.e., the red-legged partridge). 

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