aristocrat vs member of the upper crust

aristocrat

noun
  • One of the aristocracy, nobility, or people of rank in a community; one of a ruling class; a noble (originally in Revolutionary France). 

  • A proponent of aristocracy; an advocate of aristocratic government. 

member of the upper crust

How often have the words aristocrat and member of the upper crust occurred in a corpus of books? (source: Google Ngram Viewer )