kindle vs spark up

kindle

verb
  • To start (a fire) or light (a torch, a match, coals, etc.). 

  • To arouse or inspire (a passion, etc). 

  • To begin to grow or take hold. 

  • To bring forth young; to give birth. 

noun
  • A group of kittens. 

adj
  • pregnant 

spark up

verb
  • To light up; light a cigarette or start smoking a pipe, bong, etc. 

  • To provide electrification. 

  • To initiate (a conversation, debate etc.) 

  • to make more exotic or fun 

  • to rekindle 

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