Rolls-Royce vs crème de la crème

Rolls-Royce

noun
  • A car made by this manufacturer. 

  • Anything that is the best of its type; the best quality product possible. 

name
  • any of several British companies that make motor cars, aero engines, etc. 

crème de la crème

noun
  • Best of the best; something superlative; the very best. 

How often have the words Rolls-Royce and crème de la crème occurred in a corpus of books? (source: Google Ngram Viewer )