daylight robbery vs highway robbery

daylight robbery

noun
  • Used other than figuratively or idiomatically: see daylight, robbery. 

  • Conduct which unfairly deprives an opponent of an advantage or a win; (countable, rare) an instance of this. 

  • The practice of cheating or of imposing an exorbitant charge for a product or service; (countable, rare) an instance of this. 

highway robbery

noun
  • The act of robbing a traveler on a public road. 

  • Said of excessive or exorbitant prices. 

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