become of vs occur

become of

verb
  • to happen to, to occur to. 

occur

verb
  • To happen or take place. 

  • To present or offer itself. 

  • To be present or found. 

  • To come or be presented to the mind; to suggest itself. 

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