Berliner vs Kitchener bun

Berliner

noun
  • A doughnut (donut) with a sweet filling. 

  • A native or inhabitant of Berlin. 

  • A newspaper format with pages normally measuring about 315 by 470 millimetres (12.4 in × 18.5 inches), slightly taller and wider than a tabloid but narrower and shorter than a broadsheet. 

Kitchener bun

noun
  • An open-faced cream-and-jelly version of the Berliner (“jelly donut”) found in South Australia 

How often have the words Berliner and Kitchener bun occurred in a corpus of books? (source: Google Ngram Viewer )