banknote vs chicken feed

banknote

noun
  • A piece of paper currency. 

  • A promissory note issued by a bank, payable at a given time to a specific beneficiary. 

chicken feed

noun
  • A very small or insignificant quantity, especially of money. 

  • Food (usually grain) given to poultry. 

How often have the words banknote and chicken feed occurred in a corpus of books? (source: Google Ngram Viewer )