elicit vs instigate

elicit

verb
  • To evoke, educe (emotions, feelings, responses, etc.); to generate, obtain, or provoke as a response or answer. 

  • To draw out, bring out, bring forth (something latent); to obtain information from someone or something. 

  • To use logic to arrive at truth; to derive by reason 

instigate

verb
  • to goad or urge (a person) forward, especially to wicked actions; to provoke 

  • to incite; to bring about by urging or encouraging 

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