dago vs guinea

dago

noun
  • A person of Italian descent. 

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

guinea

noun
  • A person of Italian descent. 

  • Synonym of guinea fowl 

  • A gold coin originally worth twenty shillings; later (from 1717 until the adoption of decimal currency) standardised at a value of twenty-one shillings. 

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