What country has the largest concentration of donut shops in the world?

Doughnut shops have been described as common in Canada and as a "national institution", and doughnuts have been described as an "unofficial national food." Per capita, the largest concentration of doughnut shops in the world exist in Canada, and Japan has the second-highest concentration per capita. Per capita, Canadians eat the most doughnuts compared to all world countries. The large number of Tim Hortons restaurants in Canada (over 4,600) significantly contributes to this consumption rate. Although the doughnut is often seen as an American icon, it has become Canada's unofficial national snack. The popularity of the deep fried treats has to do with Canada's love affair with coffee, reports CBC's Beth Harrington. Coffee and doughnuts go hand in hand. And since coffee is Canada's number one beverage, its partner in crime, the humble doughnut, ranks up there in popularity.