fuck all vs who cares

fuck all

det
  • Nothing at all or very little. 

pron
  • Nothing at all or very little. 

who cares

phrase
  • A reply that diminishes the importance of another speaker's immediately preceding statement. 

  • A reply to an unimportant or irrelevant statement, indicating indifference on the part of the speaker. 

How often have the words fuck all and who cares occurred in a corpus of books? (source: Google Ngram Viewer )