disaster area vs pigsty

disaster area

noun
  • An area that looks like one that has suffered a natural disaster. 

  • An area that has been the site of a natural disaster that receives an official designation entitling residents and organizations within that area to receive relief and benefits. 

pigsty

noun
  • A dirty or very untidy place. 

  • An enclosure where pigs are kept. 

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