iota vs spit in the ocean

iota

noun
  • A jot; a very small, insignificant quantity. 

  • The ninth letter of the Greek alphabet. 

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 iota and spit in the ocean occurred in a corpus of books? (source: Google Ngram Viewer )