dispose of vs jettison

dispose of

verb
  • To get rid of. 

  • To transfer to another's control. 

  • To arrange in an orderly way. 

  • To deal with conclusively with a threat or a difficult situation. 

  • To have available, or at one's disposal. 

jettison

verb
  • To let go or get rid of as being useless or defective. 

  • To eject from a boat, submarine, aircraft, spaceship or hot-air balloon, so as to lighten the load. 

noun
  • Items that have been or are about to be ejected from a boat or balloon. 

  • The action of jettisoning items. 

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