afternoon tea vs bubble tea

afternoon tea

noun
  • A formal afternoon meal comprising light snacks, accompanied by tea. 

  • A small meal or snack eaten between lunch and dinner (supper); a period of time set aside for this purpose, taken as a break from work or from a conference. 

bubble tea

noun
  • Sweetened tea with milk and tapioca pearls, often including fruit juice, syrup and other ingredients. 

How often have the words afternoon tea and bubble tea occurred in a corpus of books? (source: Google Ngram Viewer )