Qing vs Qing dynasty

Qing

name

  • Qing dynasty (1644–1912), the last imperial dynasty of China. 

Qing dynasty

name

  • The last dynasty of China, lasting from 1644 to 1912 C.E.. 

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