extravagance vs self-indulgence

extravagance

noun
  • Prodigality, as of anger, love, expression, imagination, or demands. 

  • Excessive or superfluous expenditure of money. 

self-indulgence

noun
  • Excessive or immoderate indulgence of one's own personal desires and needs above all others. 

How often have the words extravagance and self-indulgence occurred in a corpus of books? (source: Google Ngram Viewer )