clientage vs constituency

clientage

noun
  • clients collectively; clientele 

  • the condition of being a client 

constituency

noun
  • An interest group or fan base. 

  • The voters of a candidate. 

  • A district represented by one or more elected officials. 

  • The residents of such a district. 

  • The voters within such a district. 

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