pommy vs southerner

pommy

noun
  • A pom; a person of British descent, a Briton; an Englishman. 

adj
  • English; British. 

southerner

noun
  • A native or inhabitant of the south of a region (or of the world as a whole), such as the United Kingdom. 

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