customer vs patron

customer

noun
  • A patron, a client; one who purchases or receives a product or service from a business or merchant, or intends to do so. 

  • A native official who exacted customs duties. 

  • A person, especially one engaging in some sort of interaction with others. 

patron

noun
  • A guardian or intercessor; synonym of patron saint. 

  • One who protects or supports; a defender or advocate. 

  • An influential, wealthy person who supported an artist, craftsman, a scholar or a noble. 

  • A customer, as of a certain store or restaurant. 

  • A protector of a dependent, especially a master who had freed a slave but still retained some paternal rights. 

  • One who has gift and disposition of a benefice. 

  • A padrone. 

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