anybody's guess vs quandary

anybody's guess

noun
  • Synonym of anyone's guess 

quandary

noun
  • A state of not knowing what to decide; a state of difficulty or perplexity; a state of uncertainty, hesitation or puzzlement. 

  • A dilemma, a difficult decision or choice. 

How often have the words anybody's guess and quandary occurred in a corpus of books? (source: Google Ngram Viewer )