drop in the sea vs maravedi

drop in the sea

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

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. 

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