defoliation vs depredation

defoliation

noun
  • The separation of ripened leaves from a branch or stem; the falling or shedding of the leaves. 

depredation

noun
  • An act of consuming agricultural resources (crops, livestock), especially as plunder. 

  • A raid or predatory attack. 

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