Not that he needs one, but North Korean Olympians have given Kim Jong Un an excuse to raise a glass of fine cognac and flash that cherubic grin.

Why? The “Hermit Kingdom” sent over 31 athletes to compete in the Olympic Games, and so far, seven of them have won medals, including golds in weightlifting and men’s gymnastics.

That might not be a huge haul when compared to perennial powerhouses like the U.S. and China, but it’s enough to make North Korea the most efficient Olympic performer this year, according to digital programmer Andy Barefoot.

Crunching the numbers, Barefoot put together an interactive graphic offering some perspective on which countries are faring the best relative to their participation.

North Korea, as you can see from this chart, leads the way with 22.58 medals per 100 competitors sent. The U.S., which sent the most athletes to Rio, is still doing well at number 4, with 14.18 medals per 100 competitors.

andybarefoot.com

Here are some other notable stats revealed by clicking around Barefoot’s work:

Kosovo’s lone gold medal winner, who took home the top prize in judo, was enough to make the small Balkan country the most efficient when it comes to gold medals. Of course, Kosovo only sent eight athletes. North Korea managed third by this metric.

Grenada, winner of exactly one silver so far, tops the list in terms of “population talent,” determined by the number of medals won per million of population. Bahamas and New Zealand are pretty far behind at second and third, respectively.

Ranking nations by the number of competitors sent per million of population shows that the Cook Islands earns top honors for “participation,” followed by Palau and San Marino.