divulge vs leak out

divulge

verb
  • To make public or known; to communicate to the public; to tell (information, especially a secret) so that it may become generally known. 

  • To indicate publicly; to proclaim. 

leak out

verb
  • To be revealed (especially, of information intended to be kept secret). 

  • To spill or pour out, because of a leak. 

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