drop in the sea vs fleck

drop in the sea

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

fleck

noun
  • A small amount. 

  • A lock, as of wool. 

  • A flake. 

  • A small spot or streak; a speckle. 

verb
  • To mark (something) with small spots. 

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