citizenship vs freedom of the city

citizenship

noun
  • The status of being a citizen, in its various senses. 

  • The state of being a citizen, in its various senses. 

freedom of the city

noun
  • The rights and privileges enjoyed by the freemen of medieval cities (their "citizens"), but not by outsiders, bondsmen, or others. 

  • An honor bestowed by certain cities, towns, and (UK) local councils, including those of rural counties. 

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