blow-up vs make mountain out of molehill

blow-up

noun

  • An enlargement (e.g. of a photograph). 

  • An explosion (physical or emotional). 

adj

  • Inflatable; able to be blown up. 

make mountain out of molehill

How often have the words blow-up and make mountain out of molehill occurred in a corpus of books? (source: Google Ngram Viewer )