Blighty vs Old Dart

Blighty

name

  • Great Britain, Britain, or England, especially as viewed from abroad. 

noun

  • Synonym of Blighty one 

Old Dart

name

  • Britain, England, London, or Ireland; the Old Country. 

  • Dartmouth Royal Navy College. 

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