SF/F/H vs speculative fiction

SF/F/H

noun
  • The parent genre encompassing the genres of science fiction, fantasy fiction and horror fiction; speculative fiction; imaginative fiction; non-mimetic fiction. 

speculative fiction

noun
  • A class of fiction involving fantastic, supernatural or futuristic elements, including fantasy, horror, and science fiction, dealing with worlds, themes, and characters not part of everyday life. 

  • A particular work belonging to this class. 

How often have the words SF/F/H and speculative fiction occurred in a corpus of books? (source: Google Ngram Viewer )