dependence vs self-government

dependence

noun
  • The state of being dependent, of relying upon another. 

  • An irresistible physical or psychological need, especially for a chemical substance. 

self-government

noun
  • The governance of a region by its own populace; autonomy. 

How often have the words dependence and self-government occurred in a corpus of books? (source: Google Ngram Viewer )