Frankfurt vs Roger

Frankfurt

name
  • The German financial industry. 

  • Frankfurt an der Oder, a sizable town in Brandenburg, in eastern Germany. 

  • The European Central Bank. 

Roger

name
  • A male given name from the Germanic languages. 

  • A surname originating as a patronymic. 

  • Jolly Roger (pirate flag) 

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