Barack Obama is the 44th president of the USA. In the history of that country, four presidents have been murdered. This means that almost 9.1% of the USA presidents have been killed during their terms. Another 11 presidents died of natural causes during their terms. This sums up to an impressive number: more than 1⁄3 of the presidents of the USA died while presidents of the USA. Therefore, one can easily conclude that president of the USA is one of the most dangerous jobs of the world!
(I was convinced that it was the most dangerous job of the world, until Mírian reminded me that among popes, the mortality rate is of 100%…)