occur vs supervene

occur

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

  • To happen or take place. 

  • To present or offer itself. 

  • To be present or found. 

supervene

verb
  • To be dependent on something else for existence, truth, or instantiation. 

  • To follow (something) closely, either as a consequence or in contrast. 

  • To be dependent on an earlier event. 

  • To supersede. 

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