Firearms were used to kill 13,286 people in the U.S. in 2015. The population at that time was 316 million people. That is, 0.0042% of the population died by guns. Counting accidents, police shootings, mass shootings, and good old homicides, that is 167 times smaller than the average population growth rate in the US. In comparison, car accidents, vehicular homicide, vehicular manslaughter and suicide caused 38,000 deaths in the US. That's more than twice as many deaths. Gun deaths accounted for 0.5% of all deaths in 2015, and mass shootings accounted for 2% of all gun deaths. Mass shootings accounted for 0.000001% of all deaths in America. Hepatitis C killed more people than mass shooters. Sepsis killed more people than all guns in the United States. Drug abuse killed more people than guns. Obesity-related problems killed more people than guns.
As for the graphic, that INCLUDES SUICIDE. Taking that away brings us to 4.3 per 100,000 people in America. Which, if we take suicide away from gun deaths in all those countries, we get much more manageable numbers, like 1.2 per 100,000 people in Canada, and 0.08 per 100,000 in Germany.
[Edit]: in America