promo vs promulgate

promo

verb
  • To promote; to publicize. 

noun
  • an interview or monologue intended to promote a character or an upcoming match. 

promulgate

verb
  • To make known or public. 

  • To put into effect as a regulation. 

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