aggravating circumstance vs exasperation

aggravating circumstance

noun
  • A factor that increases the culpability or deleterious consequences of a wrongful act. 

exasperation

noun
  • Increase of violence or malignity; aggravation; exacerbation. 

  • The act of exasperating or the state of being exasperated; irritation; keen or bitter anger. 

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