jakes vs little boys' room

jakes

noun
  • .]](now chiefly Ireland) A place to urinate and defecate: an outhouse or lavatory. 

little boys' room

noun
  • Synonym of men's room: a public lavatory intended for use by men. 

  • A room belonging to or used by little boys, particularly their bedroom. 

How often have the words jakes and little boys' room occurred in a corpus of books? (source: Google Ngram Viewer )