apanage vs decrement

apanage

verb
  • To confer an apanage upon. 

noun
  • A perquisite that is appropriate to one's position; an accompaniment. 

  • A grant (especially by a sovereign) of land (or other source of revenue) as a birthright. 

decrement

verb
  • To decrease a value by a basic quantity unit. 

noun
  • A small quantity removed or lost. One of a series of regular subtractions. 

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