dear heart vs sweetie

dear heart

noun
  • Term of affection; sweetheart. 

sweetie

noun
  • A sweetheart. 

  • A person who is much loved. 

  • A fruit that is a crossbreed between a grapefruit and a pomelo, originating in Israel. 

  • A sweet; a candy. 

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