Joe vs joe

Joe

noun
  • A male; a guy; a fellow. 

name
  • A diminutive of the male given names Joseph, Josiah, Joel, or Josias. 

joe

noun
  • Synonym of johannes (“An old Portuguese gold coin bearing a figure of John V of Portugal.”) 

  • Coffee. 

  • A spy, especially a double agent. 

  • A male; a guy; a fellow. 

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