dispassionateness vs nonchalance

dispassionateness

noun
  • The state or quality of being dispassionate. 

nonchalance

noun
  • Indifference, unconcern; carelessness; coolness; disregard, detachment. 

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