People's Republic of China vs Yuan

People's Republic of China

name
  • Official name of the country popularly known as China, as opposed to the Republic of China (Taiwan). 

Yuan

name
  • The imperial dynasty of China from 1279 to 1368. 

  • A surname from Chinese. 

How often have the words People's Republic of China and Yuan occurred in a corpus of books? (source: Google Ngram Viewer )