decency vs indecency

decency

noun
  • That which is proper or becoming. 

  • The quality of being decent; propriety. 

indecency

noun
  • Something showing lack of decency; something (such as a word) that is indecent. 

  • Lack of decency; the property or degree of being indecent 

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