instructions vs mandate

instructions

mandate

verb
  • To authorize. 

  • To make mandatory. 

noun
  • An order by the League of Nations to a member nation to establish a government responsible for a conquered territory, as the colonies of Germany after World War I. 

  • A period during which a government is in power. 

  • Such a territory. 

  • An official or authoritative command; an order or injunction; a commission; a judicial precept; an authorization. 

  • The order or authority to do something, as granted to a politician by the electorate. 

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