US-ian vs Western Hemispherian

US-ian

noun

  • An inhabitant or citizen of the United States of America. 

adj

  • Of or pertaining to the United States of America. 

Western Hemispherian

noun

  • An inhabitant of the Western Hemisphere 

How often have the words US-ian and Western Hemispherian occurred in a corpus of books? (source: Google Ngram Viewer )