Qing vs Xia

Qing

name

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

Xia

name

  • an ancient dynasty in China. 

  • A surname. 

  • A county of Yuncheng, Shanxi, China. 

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