drop in the sea vs spit in the ocean

drop in the sea

noun

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

spit in the ocean

noun

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

  • A variety of poker involving an extra dealt card shared by all players. 

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