bro vs s/he

bro

pron
  • he or him 

noun
  • fratboy (or someone that espouses the fraternity bro culture) 

  • brother (a male comrade or friend; one who shares one’s ideals) 

  • brother (usually used to address a male) 

  • brother (a male sibling) 

s/he

pron
  • he or she 

How often have the words bro and s/he occurred in a corpus of books? (source: Google Ngram Viewer )