container deposit vs earnest money

container deposit

noun
  • A monetary deposit on a beverage or other container at the point of sale, refundable when the container is returned for reuse, recycling or proper disposal. 

earnest money

noun
  • Money paid as a deposit to show intent to buy or to reserve an item to be purchased; especially, money accompanying an offer to buy real estate. 

How often have the words container deposit and earnest money occurred in a corpus of books? (source: Google Ngram Viewer )