drop in the sea vs loose change

drop in the sea

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

loose change

noun
  • A sum of money considered small or insignificant. 

  • Coins of little value kept in one's pocket or bag. 

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