recidivism vs retrogression

recidivism

noun
  • Returning to a negative behavior after having stopped it for a period of time. 

  • Committing new offenses after a crime committed in the past. 

  • Chronic repetition of criminal or other antisocial behavior. 

retrogression

noun
  • A return to a less complex condition. 

  • A deterioration or decline to a previous state. 

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