SF/F/H vs imaginative 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. 

imaginative fiction

noun
  • Fiction not based on reality; a class of fiction including but not necessarily limited to fantasy, horror and science fiction. 

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