I'm sorry vs pardon

I'm sorry

phrase
  • Indicates that the speaker is confused or requests information to be repeated; come again?, say again?, I beg your pardon?; see also Thesaurus:say again 

  • Indicates the speaker's commiseration. 

  • Indicates the speaker's apology. 

pardon

noun
  • An order that releases a convicted criminal without further punishment, prevents future punishment, or (in some jurisdictions) removes an offence from a person's criminal record, as if it had never been committed. 

  • Forgiveness for an offence. 

verb
  • To forgive (a person). 

  • To refrain from exacting as a penalty. 

  • To grant an official pardon for a crime. 

intj
  • Often used when someone does not understand what another person says. 

How often have the words I'm sorry and pardon occurred in a corpus of books? (source: Google Ngram Viewer )