Chinaman vs qing

Chinaman

noun
  • A sailing ship of the 18th and 19th centuries engaged in the Old China Trade 

  • Synonym of Chinaperson, a Chinese person of either gender. 

qing

noun
  • A sounding stone, a Chinese musical instrument. 

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