proclamation vs refutation

proclamation

noun
  • A statement which is proclaimed; formal public announcement. 

refutation

noun
  • A vocal answer to an attack on one's assertions. 

  • An act of refuting or disproving; the disproving of an argument, opinion, testimony, doctrine or theory by argument or countervailing proof; evidence of falseness. 

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