devastation vs natural wastage

devastation

noun
  • Waste or misapplication of the assets of a deceased person by an executor or administrator; devastavit. 

  • The act of devastating, or the state of being devastated; a laying waste. 

natural wastage

noun
  • Decrease of workforce caused by non-replacement of retiring or voluntarily resigning employees and not by deliberate layoffs. 

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