retrocession vs shrinkage

retrocession

noun
  • The act of retroceding; a going back. 

  • The transfer of risk from one reinsurer to another. 

  • The return of land, rights, etc. previously ceded. 

  • Metastasis of an eruption or tumour from the surface to the interior of the body. 

shrinkage

noun
  • The loss of merchandise through theft, spoilage, and obsolescence. 

  • The act of shrinking, or the proportion by which something shrinks. 

  • The reduction in size of the male genitalia when cold, such as from immersion in cold water. 

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