Sturm und Drang vs upheaval(s)

Sturm und Drang

noun
  • A proto-Romantic movement in German literature and music which occurred from the late 1760s to the early 1780s, emphasizing individual subjectivity and the free expression of emotions. 

  • Turmoil; a period of emotional intensity and anxiety. 

upheaval(s)

How often have the words Sturm und Drang and upheaval(s) occurred in a corpus of books? (source: Google Ngram Viewer )