free trade vs interventionism

free trade

noun
  • International trade without government interference, especially from tariffs or duties on imports. 

interventionism

noun
  • The political practice of intervening in a sovereign state's affairs. 

  • The medical practice of trying to prolong someone's life. 

  • The idea that a person develops cognition through explicit instruction by others, and not merely by being nurtured and allowed to develop individually. 

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