bedlam vs perfect storm

bedlam

noun
  • A place or situation of chaotic uproar, and where confusion prevails. 

perfect storm

noun
  • A situation whereby several problems come together and make everything worse. 

  • A powerful hurricane or other major weather disturbance, especially as produced by a combination of meteorological conditions. 

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