drop in the sea vs ounce

drop in the sea

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

ounce

noun
  • Any small amount, a little bit. 

  • A troy ounce, weighing ¹⁄₁₂ of a troy pound, or 480 grains, or 31.1035 grams. 

  • A British imperial fluid ounce, with a volume of ¹⁄₂₀ of an imperial pint, 1.7339 cubic inches or 28.4131 millilitres. 

  • An avoirdupois ounce, weighing ¹⁄₁₆ of an avoirdupois pound, or 28.3495 grams. 

  • A US fluid ounce, with a volume of ¹⁄₁₆ of a US pint, 1.8047 cubic inches or 29.5735 millilitres. 

  • Synonym of onza, a particularly aggressive cougar or jaguarundi in Mexican folklore. 

  • Synonym of snow leopard, Panthera uncia. 

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