opinion vs vox populi

opinion

noun
  • The formal decision, or expression of views, of a judge, an umpire, a doctor, or other party officially called upon to consider and decide upon a matter or point submitted. 

  • A belief, judgment or perspective that a person has formed, either through objective or subjective reasoning, about a topic, issue, person or thing. 

  • a judicial opinion delivered by an Advocate General to the European Court of Justice where he or she proposes a legal solution to the cases for which the court is responsible 

  • The judgment or sentiment which the mind forms of persons or things; estimation. 

vox populi

noun
  • The public comment portion of a public meeting. 

  • voice of the people. 

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