cream of society vs upper crust

cream of society

upper crust

noun
  • Used other than figuratively or idiomatically: see upper, crust. The topmost layer of a bread, pastry dish, or other item with a hardened coating. 

  • The social elite, the highest social class. 

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