National Doughnut Day: 9 things you didn't know about doughnuts

In honor of National Donut Day, we share some fun facts about the sweet treats you probably didn't know. Find out where to get free doughnuts at

* In the U.S. alone, more than 10 billion donuts are made every year. Between 27 locations, Lamar's Donuts produces 17 million donuts per year.

* The US donut industry is worth 3.6 billion dollars.

* The largest donut ever made was an American-style jelly donut weighing 1.7 tons, which was 16 feet in diameter and 16 inches high in the center.

* Per capita, Canada has more donuts shops than any other country.

* The hole in the donut's center appeared in the first half of the 19th Century and allows the donut to cook more evenly.

* The Dutch are often credited with bringing donuts to the U.S. with their olykoeks, or oily cakes in the 1800s.

* Adolph Levitt invented the first donut machine in 1920.

* Ray's Original Glazed Donut only has 220 calories, while a bagel and cream cheese averages 450 calories.

* The Guinness World record for donut eating is held by John Haight, who consumed 29 donuts in just over 6 minutes.

The doughnut facts are courtesy of Lamar's Donuts in Kansas City, Mo.

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