dago vs greaseball

dago

noun
  • A person of Italian, Spanish, Portuguese, Greek, or other Mediterranean descent. 

  • A person of Italian descent. 

greaseball

noun
  • A person of Italian, Spanish, Portuguese, Greek, other Mediterranean, or Latin American descent. 

  • A biker, a tough. 

  • A rocker or metalhead, especially one who listens to 1950s rock and roll or 1980s thrash metal. 

  • A mechanic. 

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