Podunk vs backwoods

Podunk

name
  • Mythical small town of no importance. 

backwoods

noun
  • Partly or wholly uncleared forest, especially in North America. 

  • A remote or sparsely inhabited region, especially in North America; away from big towns and from the influence of modern life. 

adj
  • Rough, uncouth, coarse, or crude in social matters. 

  • Pertaining to the backwoods. 

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