amend vs stick to

amend

verb
  • To make better; improve. 

  • To make a formal alteration (in legislation, a report, etc.) by adding, deleting, or rephrasing. 

  • To become better. 

noun
  • An act of righting a wrong; compensation. 

stick to

verb
  • Used other than figuratively or idiomatically: see stick, to. 

  • To persist; to continue (to use, do, etc.) 

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