biog vs memoir

biog

noun
  • A biography. 

memoir

noun
  • An autobiography; a book describing the personal experiences of an author. 

  • A biography; a book describing the experiences of a subject from personal knowledge of the subject or from sources with personal knowledge of the subject. 

  • Any form of narrative describing the personal experiences of a writer. 

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