carry on vs soldier on

carry on

verb
  • To continue, maintain or pursue (:an activity or enterprise) 

  • To act or behave; especially to misbehave so as to attract attention. 

  • To continue or proceed as before. 

  • To talk continuously about, often in an excessively excited way 

  • To have an illicit sexual or flirtatious relationship. 

  • To take baggage or luggage onto an airplane, rather than check it. 

soldier on

verb
  • To continue or persist, despite adversity or difficulty. 

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