decadence vs deterioration

decadence

noun
  • A state of moral or artistic decline or deterioration; decay 

  • The quality of being luxuriously self-indulgent. 

deterioration

noun
  • The process of making or growing worse, or the state of having grown worse. 

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