perspire vs sweat buckets

perspire

verb
  • To emit (sweat or perspiration) through the skin's pores. 

  • To be evacuated or excreted, or to exude, through the pores of the skin. 

sweat buckets

verb
  • To sweat very profusely. 

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