chump change vs drop in the ocean

chump change

noun
  • A sum of money considered to be insignificant. 

  • An amount of remuneration, reward, or other monetary recompense considered to be insultingly small. 

drop in the ocean

noun
  • A very small or insignificant amount; something of little importance. 

How often have the words chump change and drop in the ocean occurred in a corpus of books? (source: Google Ngram Viewer )