two cents vs two penn'orth

two cents

noun
  • One's opinion or thoughts. 

  • A nearly worthless amount, alluding to placing a copper penny on each of the eyelids of a pauper's or slave's body before burial. 

two penn'orth

noun
  • One's opinion or thoughts. 

  • Two pennies' worth. 

How often have the words two cents and two penn'orth occurred in a corpus of books? (source: Google Ngram Viewer )