Britain vs the United Kingdom

Britain

name
  • Brittany. 

  • The British Isles. 

  • The island of Great Britain, consisting of England, Scotland and Wales, especially during antiquity. 

  • The British state and its dominions and holdings; the British Empire. 

  • The United Kingdom. 

  • The British Empire. 

the United Kingdom

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