thanks vs thanks a bunch

thanks

intj

  • Used to express appreciation or gratitude. 

noun

  • An expression of gratitude. 

  • Grateful feelings or thoughts. 

thanks a bunch

intj

  • A mildly sarcastic thank you. 

  • An unsarcastic thank you. 

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