The idea of the gun-toting American is a little cliche, but a 2007 study demonstrates that this stereotype is firmly based in fact. Of the estimated 875 million firearms that exist in the world, almost a third are owned by US citizens. This can partly be attributed to the country’s size and relative affluence, but viewed as a ratio, there are still 90 guns for every 100 citizens — making it the most heavily armed society in the world.
The closest per-capita gun ownership to the US is Yemen – 61 firearms for every 100 citizens – closely followed by Finland, and then Switzerland. Perhaps the most worrying statistic is that, worldwide, only 12% of firearms are registered with the authorities.