chump change vs pocket change

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. 

pocket change

noun
  • An insignificant amount of money. 

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