I know vs you're telling me

I know

phrase
  • A response used to indicate that speaker was in agreement with the preceding statement before it was made. 

  • An emphatic assertion that one has a solution, an answer, or an idea. 

you're telling me

phrase
  • Used to indicate that the speaker was in agreement with the preceding statement before it was made. 

How often have the words I know and you're telling me occurred in a corpus of books? (source: Google Ngram Viewer )