foo vs jun

foo

noun
  • A metasyntactic variable used to represent an unspecified entity. If part of a series of such entities, it is often the first in the series, and followed immediately by bar. 

intj
  • Expression of disappointment or disgust. 

jun

noun
  • A monetary unit of North Korea and formerly of South Korea, equal to one hundredth of a won. 

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