uncork vs unfasten

uncork

verb
  • To open (a bottle or other container sealed with a cork or stopper) by removing the cork or stopper from. 

  • To release. 

unfasten

verb
  • To detach from any connecting agency or link; to disconnect. 

  • To come unloosed or untied. 

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