arrivederci vs see you soon

arrivederci

intj
  • farewell, goodbye, see you later (non-definitive farewell) 

noun
  • An Italian farewell by saying "arrivederci". 

see you soon

intj
  • goodbye; something said at a farewell, not necessarily literally meaning that the speaker will see the hearer(s) again. 

How often have the words arrivederci and see you soon occurred in a corpus of books? (source: Google Ngram Viewer )