prohibited vs unofficial

prohibited

adj
  • Forbidden; unallowed 

unofficial

adj
  • Implicitly true but withheld and/or contradicted by authority. 

  • Not officially established. 

  • Not acting with official authority. 

  • Not listed in a national pharmacopeia etc. 

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