maravedi vs spit in the ocean

maravedi

noun
  • A very small quantity or value; the least possible amount. 

  • A former Spanish coin and unit of currency, originally issued in gold but later in silver and copper, discontinued in 1848. 

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