bathroom tissue vs tissue paper

bathroom tissue

noun
  • toilet paper. 

tissue paper

noun
  • An unspecified product made of tissue (absorbent paper), such as bathroom tissue, paper handkerchief or household towel. 

  • Thin, translucent paper used for wrapping or for protecting delicate articles. 

How often have the words bathroom tissue and tissue paper occurred in a corpus of books? (source: Google Ngram Viewer )