pickpocket vs robbery

pickpocket

noun
  • One who steals from the pocket of a passerby, usually by sleight of hand. 

verb
  • To pick pockets; to steal. 

robbery

noun
  • The act or practice of robbing. 

  • The offense of taking or attempting to take the property of another by force or threat of force. 

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